Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seen.

The boundaries of bodies are the least of all things.

For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.

Life well spent is long.

He who fears dangers will not perish by them.

O speculators about perpetual motion, how many vain chimeras have you created in the like quest? Go and take your place with the seekers after gold.

The acquisition of knowledge is always of use to the intellect, because it may thus drive out useless things and retain the good. For nothing can be loved or hated unless it is first known.