In the proem that precedes the account of the generation of the world, Timaeus provides very important elements for understanding the discourse he is about to delivery. It is a complex text that displays at least three different levels: dialectical, analogical (or metaphorical) and epistemological. In the dialectical section, Timaeus establishes that the sensible universe is a generated reality and as such has a cause; in the metaphorical section, he indicates the analogical schemes he will use to explain the genesis (...) of the cosmos (technical and biological) and the causes on which it depends. Finally, in the epistemological section he explains the reason why this exposition cannot achieve truth but must be content with likeness. (shrink)