He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.

Neither do the ignorant love wisdom or desire to become wise; for this is the grievous thing about ignorance, that those who are neither good nor beautiful think they are good enough, and do not desire that which they do not think they are lacking.

When men speak ill of thee, live so that nobody will believe them.

Remember how in that communion only, beholding beauty with the eye of the mind, he will be enabled to bring forth, not images of beauty, but realities (for he has hold not of an image but of a reality), and bringing forth and nourishing true virtue to become the friend of God and be immortal, if mortal man may.

God forever geometrizes.

It is right to give every man his due.

Ignorance, the root and the stem of every evil.