The concept of matter as it is treated in the philosophical systems of Aristotle, Thomas Aquinas, and John Duns Scotus is examined, partly to ascertain the influence which the original Aristotelian concept of matter had on the two medieval thinkers, and partly to determine which of these two thinkers remained more faithful to the original Aristotelian concept. An analysis is carried out of the views of the three philosophers regarding the ontological status of matter; the intelligibility of matter; the issue of the real distinction between matter and form; the role played by matter in individuating composite substances; and its role in defining composite substances and determining their essences. Finally, the views of Aquinas and Scotus regarding the theory of universal hylomorphism and the theory of the plurality of forms are discussed and compared. It is shown that, while most of the Franciscan philosophical tradition up to Scotus's time was far more influenced by Platonist than by Aristotelian principles, Scotus, though a Franciscan, was much closer to Aristotle than to Plato in his views regarding matter. In fact, the few deviations from the original Aristotelian concept found in Scotus's theory can be ascribed to theological concerns. It is argued, furthermore, that Scotus's views on the concept of matter are far closer to the original Aristotelian theory than our analysis shows Aquinas himself to be.

Nous entendons, dans ce mémoire, préciser le sens d'actus essendi par l’analyse de l’emploi du terme par Thomas d’Aquin. Bien que la notion d’acte d’être soit sousjacente à nombre de développements philosophiques et théologiques de l’Aquinate, elle n’est considérée pour elle-même dans aucun texte du corpus thomasien. En exposant le cadre théorique des onze unités textuelles dans lesquelles on retrouve nommément l’expression, nous explicitons les distinctions qu’opère Thomas entre l’acte d’être et les notions ontologiques corrélatives (étant, quiddité, être du jugement prédicatif et être commun). Si « actus essendi » désigne en premier lieu un principe constitutif de l’étant, il peut encore désigner le terme abstrait correspondant à cette perfection de l’étant. L’acte d’être est ainsi ce par quoi l’étant est étant; il est cependant, au plan ontologique, propre à chaque étant singulier tandis que, au plan conceptuel, le même terme exprime ce qui est commun à tous les étants. Une traduction des extraits du Scriptum super Sententiis, des Quæstiones de quolibet, de la Summa Theologiæ, des Quæstiones disputatæ De potentia, de l’Expositio libri De hebdomadibus et de la Expositio libri Metaphysicæ a été produite pour les fins de cette étude. / In this paper, we intend to precise the meaning of actus essendi by analyzing how Thomas Aquinas uses this term. If the notion of the act of being underlies a number of Aquinas’ philosophical and theological developments, it is not treated in itself in any of his writings. By exposing the theoretical framework of the eleven textual units in which the expression namely appears, we explicate how he distinguishes between the act of being and the correlative ontological notions (the being, the essence, the predicamental judgment being and common being). If « actus essendi » first designates a constitutive principle of being, it can also designate the corresponding abstract term of this perfection of being. The act of being is that by which being is being; however, it belongs, at the ontological level, to each particular being whereas at the conceptual level, the same term expresses that which is common to all beings. Extracts of the following texts have been translated in French for this purpose: Scriptum super Sententiis, Quæstiones de quolibet, Summa Theologiæ, Quæstiones disputatæ De potentia, Expositio libri De hebdomadibus and the Sententia libri Metaphysicæ.

Dans la philosophie de Thomas d’Aquin, les puissances principales de l’âme, l’intelligence et la volonté, interagissent dans les activités humaines. Une des activités les plus importantes est identifiée par le docteur comme étant la recherche de la vérité. Cette recherche s’inscrit dans la finalité ultime de l’homme. La vérité, en tant que bien de l’intelligence, est voulue par la volonté qui est un appétit rationnel. Ainsi, selon le Dominicain « la volonté veut que l’intelligence intellige ». Puisque la vérité n’est pas le seul bien proposé au libre arbitre, la volonté doit choisir de poursuivre cette fin au détriment d’autres biens concurrents. Elle doit pour se faire perfectionner les puissances de l’âme par le biais d’habitus et de vertus en plus d’éviter les vices qui conduisent à l’erreur. La recherche de la vérité est, selon Thomas d’Aquin, un acte moral. / According to the philosophy of Thomas Aquinas, the main powers of the soul, the intellect and the will, interact in human activities. One of the most important activities is identified by the doctor as the search for truth. This research is part of the ultimate purpose of man. The truth, which is the good of the intelligence, is willed by the will which is a rational appetite. Thus, according to the Dominican “the will wants that the intelligence thinks.” Because the truth is not the only good proposed to the free will, the will must choose to pursue it to the detriment of other competing goods. To achieve this goal, the will must perfect the powers of the soul through habitus and virtues while avoiding the vices that lead to errors. The search for truth is, according to Thomas Aquinas, a moral act.

Ce mémoire propose une analyse de la théorie de la volonté en relation avec le mal dans la pensée de Thomas d’Aquin. Le mal est une privation d’être et l’être est identique au bien. La volonté est une forme intellectuelle d’appétit, ainsi que la gouvernante des puissances inférieures, mais aussi de la raison qui est à la fois son principe. L’appétit est un mouvement vers ce qui est le bien d’une nature, il est donc difficile d’accepter que la volonté puisse élire son contraire qui est le mal. La thèse de Platon selon laquelle le mal n’est désiré que par ignorance est écartée, puisque le propos de Thomas est d’expliquer le consentement en faveur du mal connu. Or, si le mal peut être voulu, on ne peut le vouloir sans le référer au bien. Ainsi, le libre arbitre, bien qu’ayant Dieu pour principe, est le principe du premier mauvais choix. La compréhension de la problématique passe par la division de ce qui appartient à l’extérieur de la volonté et ensuite à l’intérieur. De soi, un acte extérieur peut être immoral, comme le vol, mais la volonté d’une intention bonne qui choisit cet acte devient mauvaise, bien qu’elle garde le mérite de sa bonne intention. Son choix mauvais est parfois dû à une certaine ignorance, mais, puisque nous n’ignorons pas toujours le mal, il faut attribuer une faiblesse à la volonté, car elle n’accomplit pas pleinement sa nature. Quand elle répète ses actes de faiblesse à l’égard du mal, elle se dispose à accueillir l’habitus de la malice, et alors elle cherche d’elle-même le mal. Aucun de ces principes, cependant, ne peut s’appliquer à l’homme originel ni au diable. Ceux-ci n’auront pour principe de leurs choix que l’orgueil dans le libre exercice de la volonté. / This paper proposes to analyse the theory of will in interaction with evil in Thomas Aquinas’s thought. Evil is a privation of being, and being is identical to good. The will is an intellectual form of appetite, as well as the governor of lower faculties and of reason, which is also its principle. Appetite is a movement towards the good of a nature; it is therefore difficult to accept that will could elect its opposite, which is evil. Plato’s thesis consisting of attributing the will towards bad to ignorance is discarded, because Thomas’s explanation concerns the consent towards evil witch is known. Now, if evil can be wanted, we cannot want it without referring it to good. In that way, free will, though having God for principle, is the principle of the first bad choice. The comprehension of the problem has to go through the division of that which belongs to the will’s exterior and to it’s interior. In itself, an exterior act can be immoral, like stealing, but the good intentioned will that choses this act then becomes evil, keeping nonetheless the merit of its good intention. The bad choice is sometimes attributable to ignorance, but since we do not always ignore evil, we have to accuse a certain weakness in the will for not being able to fulfill its nature. When it repeatedly acts weakly towards evil, it makes itself available for the mischievous habitus, and it then, on its own, searches the evil act. None of these principles, though, can apply to the original man or for the devil. They will not have any other principle for their choice than that of pride in the free exercise of their will.

In this thesis,it has been aimed to evaluate the claims of which argue that the human rights thought has been firstly formulated by Francisco de Vitoria and Bartolome de Las Casas in the early sixteenth century Spain.

Entre as cinco provas da existência de Deus que Tomás de Aquino apresentou na Summa Theologiae, sobressai a chamada “primeira via”, considerada pelo autor como a “mais manifesta”. Esta dissertação formaliza-a em lógica quantificacional, explicitando cada uma das inferências a fim de julgar sua validade e correção. Depois de explicadas as teses metafísicas que constituem o cenário da discussão — como a doutrina aristotélica das quatro causas e as distinções entre substância e acidente, ato e potência —, são examinadas as objeções de Anthony Kenny (1969) e as sugestões interpretativas de John Wippel (2000) em defesa do raciocínio de Tomás. Mostra-se que a primeira parte, que procura demonstrar a irreflexividade do movimento, é um argumento válido, mas incorreto, por conter uma premissa falsa: aquela que afirma sem restrições a atualidade do movente. Já a segunda parte, o argumento contra o regresso infinito, contém uma ambiguidade que o deixa diante de duas alternativas: ou se trata de uma petição de princípio ou de uma falácia de equivocidade. Dado o fracasso material e formal da prova, é proposta finalmente uma abordagem não-dedutiva do problema. / Among the five proofs of God’s existence presented by Thomas Aquinas in his Summa Theologiae, the so-called "first way" stands out, for being considered by the author as the "most obvious" one. This dissertation formalizes it in quantificational logic, explaining each of the inferences in order to assess its validity and soundness. After explaining the metaphysical theses that provide the backdrop for the discussion — as the doctrine of the four Aristotelian causes and the distinctions between substance and accident, act and potency — it considers the objections of Anthony Kenny (1969) and interpretive suggestions of John Wippel (2000) in defense of Thomas’ reasoning. It is shown that the first part, which seeks to demonstrate the non-reflexivity of movement, is a valid argument, but unsound, because it contains a false premise: the one that states the mover’s actuality without restrictions. The second part, the argument against the infinite regress, contains an ambiguity that leaves you faced with two alternatives: either it begs the question or it is a fallacy of equivocation. Given the material and formal failure of the proof, a non-deductive approach to the problem is finally proposed.

Thesis The Philosophy of Education, Theory and Reality focuses on the brief historical development of educational ideals, the determination of the necessary virtues of the raised man, and the subsequent comparison of the established virtues with the current educational policy of the Czech Republic. After comparing with educational documents at national level, it has been found that some of the necessary virtues in these documents are not included.

This thesis provides an historical and intellectual summary of the role of the concepts of 'substance,' and 'participation,' in the making of the doctrine of the Trinity. In the concluding chapter, a study is made of the assumptions of deconstruction, which are somewhat hostile to a substance paradigm. We argue for an appreciation of the importance of both substance and participation for the Trinity, and philosophy generally. Chapters are dedicated to individuals who have in some way contributed to perceptions of these two terms, as they pertain to the Christian notion of the Trinity. Additionally, we seek to define some philosophical problems that accompany a Trinitarian metaphysics of 'substance,' and 'participation.' The problems include those of deconstruction: issues such as 'Logocentrism,' and 'Presence.' Finally, we investigate how Trinitarian ontology can provide answers to many of the questions Derrida raises conceming the problematic future of metaphysical thinking. / Philosophy and Systematic Theology / M.Th. (Systematic Theology)

Este trabalho apresenta o argumento que Tomás de Aquino (1225-1274) oferece como a quinta das vias para demonstrar a existência de Deus na Suma de Teologia. O foco desta apresentação não é explorar o contexto histórico em que o argumento se originou, nem examinar as fontes gregas, latinas e islâmicas sobre as quais Tomás teria se baseado, mas sim analisar a possibilidade de sustentá-lo de modo atemporal como um argumento plausível a favor da existência de Deus. Minha intenção é oferecer boas razões em seu favor e rebater as objeções mais notórias em contrário, apontando os limites explicativos do argumento e oferecendo sugestões para fortalecê-lo. Inicio distinguindo diferentes tipos de teleologia e de argumentos teleológicos pela existência de Deus, comparando a quinta via com os demais argumentos teleológicos de Tomás e com o argumento de William Paley pelo projeto inteligente (Intelligent Design). Em seguida, passo à análise da própria via, mostrando evidências das inclinações e tendências a fins a que Tomás faz referência e tratando das teses metafísicas que defende a partir da observação destas inclinações. Também ofereço respostas às objeções que pretendem que esta teleologia seja redutível a leis de natureza ou ao acaso. No último capítulo, considero a segunda parte da quinta via, que afirma que tais inclinações em direção a fins dependem em última instância de uma inteligência ordenadora que seria Deus. Analisando, ao fim, em que medida procedem as objeções de que esta conclusão não passa de um antropomorfismo injustificado e de que Tomás vai além do que lhe permite a conclusão ao considerar que esta inteligência é Deus. / This work presents the argument Thomas Aquinas (1225-1274) offers as the fifth of his ways to demonstrate the existence of God in the Summa Theologiae. The main point of this presentation is not to explore the historical context in which the argument was written, neither to examine the Greek, Latin and Islamic sources upon which Thomas could have based himself, but rather to analyze the possibility of sustaining it timelessly as a plausible argument in favor of God’s existence. My purpose is to offer good reasons in its favor and to rebut the most notorious objections against it, pointing out the explanatory limits of the argument, and providing suggestions to strengthen it. I start by distinguishing different sorts of teleology and of teleological arguments for the existence of God, then I compare the Fifth Way with others teleological arguments formulated by Thomas and with the argument of William Paley for the “intelligent design” hypothesis . I also analyze the way itself, pointing out evidences for the inclinations and tendencies towards ends that Thomas refers to, also dealing with the metaphysical theses that Thomas defends based on the observation of these inclinations. Moreover, I offer answers to objections that intend to reduce teleology to laws of nature or to chance. In the last chapter, I consider the second part of Fifth Way, which affirms that those inclinations towards ends ultimately depend on an ordering intelligence that would be God. Lastly, I examine to what extent are valid the objections that claim this conclusion is simply an unjustified anthropomorphism and that Thomas goes beyond what his conclusion allows him when he takes this intelligence to be God.

Este trabalho apresenta o argumento que Tomás de Aquino (1225-1274) oferece como a quinta das vias para demonstrar a existência de Deus na Suma de Teologia. O foco desta apresentação não é explorar o contexto histórico em que o argumento se originou, nem examinar as fontes gregas, latinas e islâmicas sobre as quais Tomás teria se baseado, mas sim analisar a possibilidade de sustentá-lo de modo atemporal como um argumento plausível a favor da existência de Deus. Minha intenção é oferecer boas razões em seu favor e rebater as objeções mais notórias em contrário, apontando os limites explicativos do argumento e oferecendo sugestões para fortalecê-lo. Inicio distinguindo diferentes tipos de teleologia e de argumentos teleológicos pela existência de Deus, comparando a quinta via com os demais argumentos teleológicos de Tomás e com o argumento de William Paley pelo projeto inteligente (Intelligent Design). Em seguida, passo à análise da própria via, mostrando evidências das inclinações e tendências a fins a que Tomás faz referência e tratando das teses metafísicas que defende a partir da observação destas inclinações. Também ofereço respostas às objeções que pretendem que esta teleologia seja redutível a leis de natureza ou ao acaso. No último capítulo, considero a segunda parte da quinta via, que afirma que tais inclinações em direção a fins dependem em última instância de uma inteligência ordenadora que seria Deus. Analisando, ao fim, em que medida procedem as objeções de que esta conclusão não passa de um antropomorfismo injustificado e de que Tomás vai além do que lhe permite a conclusão ao considerar que esta inteligência é Deus. / This work presents the argument Thomas Aquinas (1225-1274) offers as the fifth of his ways to demonstrate the existence of God in the Summa Theologiae. The main point of this presentation is not to explore the historical context in which the argument was written, neither to examine the Greek, Latin and Islamic sources upon which Thomas could have based himself, but rather to analyze the possibility of sustaining it timelessly as a plausible argument in favor of God’s existence. My purpose is to offer good reasons in its favor and to rebut the most notorious objections against it, pointing out the explanatory limits of the argument, and providing suggestions to strengthen it. I start by distinguishing different sorts of teleology and of teleological arguments for the existence of God, then I compare the Fifth Way with others teleological arguments formulated by Thomas and with the argument of William Paley for the “intelligent design” hypothesis . I also analyze the way itself, pointing out evidences for the inclinations and tendencies towards ends that Thomas refers to, also dealing with the metaphysical theses that Thomas defends based on the observation of these inclinations. Moreover, I offer answers to objections that intend to reduce teleology to laws of nature or to chance. In the last chapter, I consider the second part of Fifth Way, which affirms that those inclinations towards ends ultimately depend on an ordering intelligence that would be God. Lastly, I examine to what extent are valid the objections that claim this conclusion is simply an unjustified anthropomorphism and that Thomas goes beyond what his conclusion allows him when he takes this intelligence to be God.