I've read in some book that Aristotle was really not into checking the conclusions with practice after the conclusion was made. When you're working on an idea, according to Aristotle, you use observations which are available - but you don't experiment. The result of reasoning is going to be best as can be argued, and passive observations are ok, but (active) experiments to check just fall out of picture - nobody is supposed to do them, either before or after working on the idea.
Still today I have friends and family that seem uninterested in checking their reasoning (read: assumptions) against reality, and it's the most frustrating thing to debate. How would you convince Aristotle that the principles of the scientific method is the best way to query reality?
That was some millenia and a half before Galilei.