It is impossible, or not easy, to alter by argument what has long been absorbed by habit

For knowing is spoken of in three ways: it may be either universal knowledge or knowledge proper to the matter in hand or actualising such knowledge; consequently three kinds of error also are possible.

When you are lonely, when you feel yourself an alien in the world, play Chess. This will raise your spirits and be your counselor in war

It is evidently equally foolish to accept probable reasoning from a mathematician and to demand from a rhetorician demonstrative proofs.

Pay attention to the young, and make them just as good as possible.

He is his own best friend and takes delight in privacy whereas the man of no virtue or ability is his own worst enemy and is afraid of solitude.

We are the sum of our actions, and therefore our habits make all the difference.