Aristotle's Criteria Are Demanding

Aristotle says that if the things i know cannot be false, then they are necessarily true. He is telling us how to achieve full understanding of the world around us. The posterior analytic sets out a scientific programme. According to the programme, science gets hold of explanations which are universal and based on the essential features of things. But he' still not done. Go back to the fact that you can only know something if it is true.