In Greek Late Antiquity philosophy defined itself above all through the interpretation of authoritative texts such as Plato’s dialogues or the treatises of Aristotle.This work looks at the last Late Antique commentaries on Aristotle’s Physics, the pagan Simplicius and the Christian Philoponus (both 6th cent. AD). Golitsis demonstrates how differently the two contemporaries interpreted the philosophical tradition and how this led them to deduce different routes to finding the truth.