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

There are three classes of people: those who see, those who see when they are shown, those who do not see.

A man was desired to rise from bed because the sun was already up. He replied: "If I had as far to go and as much to do as he has, I should be up by now; but having but a little way to go, I shall not get up yet."

Whoever in debate quotes authority uses not intellect, but memory.

A good painter has two main objects to paint, man and the intention of his soul.

It reflects no great honor on a painter to be able to execute only one thing well -- such as a head, an academy figure, or draperies, animals, landscapes, or the like -- in other words, confining himself to some particular object of study. This is so because there is scarcely a person so devoid of genius as to fail of success if he applies himself earnestly to one branch of study and practices it continually.

Art lives from constraints and dies from freedom.