When Thales was asked what was difficult, he said, To know one's self. And what was easy, To advise another.

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.

Once when Bion was at sea in the company of some wicked men, he fell into the hands of pirates; and when the rest said, "We are undone if we are known,"-"But I," said he, "am undone if we are not known.

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.

Plato was continually saying to Xenocrates, "Sacrifice to the Graces.

The mountains too, at a distance, appear airy masses and smooth, but seen near at hand they are rough.

Plato affirmed that the soul was immortal and clothed in many bodies successively.