The present diploma thesis is an exegetical attempt to interpret Paul's parenesis in his Letter to the Romans 14,1-15,13. It tries to find answers to the following questions: Who are the "strong in faith" (15:1)? Who are the "weak in faith" (14:1)? What "day" is meant in chapter 14:5? What kind of dietary restrictions are in the background of 14:2? What is the solution that Paul suggests? The analysis has led to the following conclusions: Paul is trying to resolve a particular dispute between two groups of believers in Rome. The "weak" probably had a problem with the "strong" eating the meat and drinking the wine defiled with idolatry (14:21) and not keeping fasting days, or certain Jewish feast days (14:3). So, the "weak" may be identified as the Jewish Christians and the "strong" with the Christians of gentile origins. Paul tries to move both groups away from judging each other (14:3) to respect the opinion of the other group (14:4) and leads them above all to mutually build loving relationships to each other (14:19). Key words: weak in faith, strong in faith, day, food, dietetary restriction, Lord, Christ, Kingdom of heaven