Life, when is spent well, is long.

A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements.

My body will not be a tomb for other creatures.

All thoughts start from emotions.

O painter skilled in anatomy, beware lest the undue prominence of the bones, sinews and muscles cause you to become a wooden painter from the desire to make your nude figures reveal all.

Every obstacle is destroyed through rigor.

life without love, is no life at all