God forever geometrizes.

In particular I may mention Sophocles the poet, who was once asked in my presence, How do you feel about love, Sophocles? are you still capable of it? to which he replied, Hush! if you please: to my great delight I have escaped from it, and feel as if I had escaped from a frantic and savage master. I thought then, as I do now, that he spoke wisely. For unquestionably old age brings us profound repose and freedom from this and other passions.

To the rulers of the state then, if to any, it belongs of right to use falsehood, to deceive either enemies or their own citizens, for the good of the state: and no one else may meddle with this privilege.

Opinion is the medium between knowledge and ignorance.

The wisest have the most authority.

Let no-one ignorant of geometry enter. Said to have been inscribed above the door of Plato's Academy.

Arithmetic is a kind of knowledge in which the best natures should be trained, and which must not be given up.