Experience proves that anyone who has studied geometry is infinitely quicker to grasp difficult subjects than one who has not.

Let us affirm what seems to be the truth, that, whether one is or is not, one and the others in relation to themselves and one another, all of them, in every way, are and are not, and appear to be and appear not to be.

There is far greater peril in buying knowledge than in buying meat and drink.

Those who practice philosophy in the right way are in training for dying and they fear death least of all men.

Do not train children to learning by force and harshness, but direct them to it by what amuses their minds.

Injustice is censured because the censures are afraid of suffering, and not from any fear which they have of doing injustice.

A grateful mind is a great mind which eventually attracts to itself great things.