The truth of things is the chief nutriment of superior intellects.
Those who, in debate, appeal to their qualifications, argue from memory, not from understanding.
He who cannot establish dominion over himself will have no dominion over others.
Just as courage is the danger of life, so is fear its safeguard.
Those who become enamoured of the art, without having previously applied to the diligent study of the scientific part of it, may be compared to mariners who put to the sea in a ship without rudder or compass and therefore cannot be certain of arriving at the wished for port.
A good painter has two main objects to paint, man and the intention of his soul. The former is easy, the latter hard as he has to represent it by the attitude and movement of the limbs.