It is better to imitate ancient than modern work.

The merit of painting lies in the exactness of reproduction. Painting is a science and all sciences are based on mathematics. No human inquiry can be a science unless it pursues its path through mathematical exposition and demonstration.

Every action needs to be prompted by a motive. To know and to will are two operations of the human mind. Discerning, judging, deliberating are acts of the human mind.

It is ordained that to the ambitious, who derive no satisfaction from the gifts of life and the beauty of the world, life shall be a cause of suffering, and they shall possess neither the profit nor the beauty of the world.

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

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

I have solved what color is, however ; I still have no idea about what line is.