Life well spent is long.

Any color is more distinctly seen when opposed to its contrary: thus, black on white, blear near yellow, green near red, and so on.

What is fair in men, passes away, but not so in art

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.

The eye which turns from a white object in the light of the sun and goes into a less fully lighted place will see everything as dark.

The organ of perception acts more readily than judgment.

It is easier to contend with evil at the first than at the last.