Music is to the mind as air is to the body.

We ought to fly away from earth to heaven as quickly as we can; and to fly away is to become like God, as far as this is possible; and to become like him is to become holy, just, and wise.

There is no necessity for the man who means to be an orator to understand what is really just but only what would appear so to the majority of those who will give judgment; and not what is really good or beautiful but whatever will appear so; because persuasion comes from that and not from the truth.

Every serious man in dealing with really serious subjects carefully avoids writing. ... There does not exist, nor will there ever exist, any writing of mine dealing with this subject.

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

The Earth is like one of those balls made of twelve pieces of skin.

The right question is usually more important than the right answer.