The discovery of a good wine is increasingly better for mankind than the discovery of a new star.

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

We must doubt the certainty of everything which passes through the senses, but how much more ought we to doubt things contrary to the senses, such as the existence of God and the soul.

Those who fall in love with practice without science are like a sailor who enters a ship without a helm or a compass, and who never can be certain whither he is going.

Just as courage is the danger of life, so is fear its safeguard.

Drawing is based upon perspective, which is nothing else than a thorough knowledge of the function of the eye.

If you do not rest on the good foundation of nature, you will labour with little honor and less profit.