Diogenes said once to a person who was showing him a dial, "It is a very useful thing to save a man from being too late for supper.

Pythagoras used to say that he had received as a gift from Mercury the perpetual transmigration of his soul, so that it was constantly transmigrating and passing into all sorts of plants or animals.

Anaximander used to assert that the primary cause of all things was the Infinite,-not defining exactly whether he meant air or water or anything else.

When asked what learning was the most necessary, he said, “Not to unlearn what you have learned!”

Arcesilaus had a peculiar habit while conversing of using the expression, "My opinion is," and "So and so will not agree to this.

There is a written and an unwritten law. The one by which we regulate our constitutions in our cities is the written law; that which arises from customs is the unwritten law.

Antisthenes used to say that envious people were devoured by their own disposition, just as iron is by rust.