T hought about the origins of Occidental Science take us back to Greece in VII and VI centuries b. C. Being the most splendour century the V century, well known as Pericles's century. It is there were first traces of occidental literatee were found and protected. Those literary texts, root of measure and principies of reason and freedom are the basic foundation not only for artistic and literary creation purposes but capital works for meaning, reason for the origin of Occidental Science. Starting from a pre-scientific thought, means of influence in the origin of rational thought and thus scientific thought, are here analysed. The fundamental literary works were considerations here stated are based on are, on the one side: The Iliad and