With regard to the principle of non-contradiction, Aristotle argued, for example, that a dress couldn't both be blue and not blue in the same respect at the same time. This was a basic principle for Aristotle.
But how do we justify this fundamental basic principle?
Aristotle argued that we couldn't actually justify the principle of non-contradiction outside of our experience since we actually use it in experience. Aristotle argued that the principle of non-contradiction is fundamental and inherent to our discourse.
He proposed that we ask an opponent if he wants to say anything,. If not, then dismiss that person.
If the opponent does say something definite then show that person that he or she is in fact making use of that very principle in asserting something definite. In the opponent's saying something definite he is ruling out the not saying of something definite.
Aristotle was eager to say that we cannot provide a foundation for what we believe outside of our perceptual scheme.
We can designate a thing in speech when it impinges on something in experience only and he argued that we couldn't talk about things that haven't entered our experience at all.
