Who sows virtue ought to reap honour.

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

The water which rises in the mountains is the blood which keeps the mountain in life.

I roamed the countryside searching for the answers to things I did not understand. Why shells existed on the tops of mountains along with the imprints of coral and plant and seaweed usually found in the sea. Why the thunder lasts a longer time than that which causes it and why immediately on its creation the lightening becomes visible to the eye while thunder requires time to travel. How the various circles of water form around the spot which has been struck by a stone and why a bird sustains itself in the air. These questions and other strange phenomena engaged my thought throughout my life.

Nothing is so much to be feared as Evil Report.

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

Fame alone raises herself to Heaven, because virtuous things are in favour with God.