Aristotle's metaphysics, roughly speaking, may be described as Plato diluted by common sense. He is difficult because Plato and common sense do not mix easily.

When a man tells you that he knows the exact truth about anything you are safe in inferring that he is an inexact man.

The Stoic assures us that what is happening now will happen over and over again. [If so, Providende would] ultimately grow weary through despair.

Orthodoxy is the grave of intelligence, no matter what orthodoxy it may be.

Whenever you find yourself getting angry about a difference of opinion, be on your guard; you will probably find, on examination, that your belief is going beyond what the evidence warrants.

Neither acquiescence in skepticism nor acquiescence in dogma is what education should produce.

Right conduct can never, except by some rare accident, be promoted by ignorance or hindered by knowledge.