Plato

Wise men speak because they have something to say; Fools because they have to say something.

The heaviest penalty for declining to rule is to be ruled by someone inferior to yourself.

Music is a moral law. It gives a soul to the universe, wings to the mind, flight to the imagination, a charm to sadness, gaiety and life to everything. It is the essence of order, and leads to all that is good, just, and beautiful, of which it is the invisible, but nevertheless dazzling, passionate, and eternal form.

We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.

The highest form of pure thought is in mathematics.