It is an acknowledged fact that we perceive errors in the work of others more readily than in our own.

A man was desired to rise from bed because the sun was already up. He replied: "If I had as far to go and as much to do as he has, I should be up by now; but having but a little way to go, I shall not get up yet."

The limiting surface of one thing is the beginning of another.

Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.

Music cannot be called otherwise than the sister of painting, for she is dependent upon hearing, a sense second to sight, and her harmony is composed of the union of its proportional parts sounded simultaneously, rising and falling in one or more harmonic rhythms.

Vitality and beauty are gifts of Nature for those who live according to its laws.

Do not reveal, if liberty is precious to you; my face is the prison of love.