All men by nature desire to know. An indication of this is the delight we take in our senses; for even apart from their usefulness they are loved for themselves...

To be always seeking after the useful does not become free and exalted souls.

Imagination is a sort of faint perception.

If the art of ship-building were in the wood, ships would exist by nature.

He who has never learned to obey cannot be a good commander.

To say of what is that it is not, or of what is not that it is, is false, while to say of what is that it is, and of what is not that it is not, is true.

Finally, if nothing can be truly asserted, even the following claim would be false, the claim that there is no true assertion.