The aim of this study is twofold: to identify the theological purpose underlying the depiction of angels at certain key points in the history of their use, and to explore how far that deeper theological rationale can be re-appropriated for our own day. This study first traces the progression of the angelic motif in the Hebrew Scriptures. By examining numerous pericopes in the Pentateuch, major prophets and Daniel, I demonstrate that the metamorphosis of higher-order beings like the angel of the Lord, cherubim and seraphim, is directly related to the writers' desire to enhance God's transcendence. Next, I evaluate pseudo-Denys' hierarchical angelology, which prominent theologians like Luther and Calvin condemned as little more than a Neoplatonic scheme for accessing God through angels. I propose that not only has pseudo-Denys' Neoplatonism been overstated, but that his angelology is particularly noteworthy for the way it accentuates Christ's eucharistic immanence to the Church. Then I maintain that because assessments of Aquinas' angelology are often based upon the Summa Theologiae, his views are wrongly portrayed as overtly philosophical, rather than biblical and exegetical. In his lesser-known biblical commentaries, however, Aquinas pushes the semantic range of the word ‘angel' to include aspects of the physical world, which unveils an imaginative, Christocentric, and scriptural dimension of his angelology that is rarely acknowledged. The conclusion considers how contemporary figures and movements relate to these three angelologies. Barth emphasises the transcendent God but unlike Hebrew Scripture, weakens connections between God and angels. New Ageism affirms the immanent angel but unlike pseudo-Denys, does so at the expense of Christology and ecclesiology. Contemporary ecological discourse generally lacks Aquinas' appreciation for an imaginative, supernatural approach to the world. Finally, I ground the angels' relationship to transcendence, immanence and imagination in an experiential, eucharistic context.

L’ambition de cette thèse, qui se présente en sept chapitres regroupés en trois parties, est de reprendre l’ensemble du Corpus dionysien pour en définir un principe de cohérence : la théologie négative. Dans le sillage des recherches antérieures, souvent centrées sur une des œuvres qui lui sont attribuées ou sur une thématique particulière, on s’est interrogé sur l’histoire et la complexité de plusieurs concepts centraux de l’œuvre : théologie négative, symbole, hiérarchie. Et, en proposant de considérer la Hiérarchie ecclésiastique comme l’achèvement du Corpus – c’est au bref traité de la Théologie mystique qu’on attribuait volontiers cette place – nous montrons comment l’apophase ou la théologie négative s’enrichit, s’approfondit, d’une dimension liturgique, au-delà de l'affirmation et de la négation. / The purpose of this thesis, consisting of seven chapters grouped under three sections, is to reconsider the whole dionysian Corpus and to define the principle of its consistency, that is negative theology. Following the previous research, often focusing on one of the treatises or a main theme, we start with the history and the complexity of several key concepts within the Corpus: negative theology, symbol, hierarchy. We suggest that Ecclesiastical Hierarchy should be considered as the final step of Dionysius’ theology (rather than Mystical Theology as usually), and that leads us to study how the apophasis or the negative theology deepens into a liturgical dimension, beyond affirmation and negation.