Xenophanes speaks thus:—And no man knows distinctly anything,And no man ever will.

Nothing can be produced out of nothing.

Protagoras asserted that there were two sides to every question, exactly opposite to each other.

It takes a wise man to discover a wise man.

Xenophanes was the first person who asserted... that the soul is a spirit.

In the time of Pythagoras that proverbial phrase Ipse dixit was introduced into ordinary life.

Among what he called his precepts were such as these: Do not stir the fire with a sword. Do not sit down on a bushel. Do not devour thy heart.

He calls drunkenness an expression identical with ruin.

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.

One of the sophisms of Chrysippus was, "If you have not lost a thing, you have it."