Love shows itself more in adversity than in prosperity; as light does, which shines most where the place is darkest.

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

The sun gives spirit and life to the plants and the earth nourishes them with moisture.

There is no result in nature without a cause; understand the cause and you will have no need of the experiment.

Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain whether he is going. Practice must always be founded on sound theory, and to this Perspective is the guide and the gateway; and without this nothing can be done well in the matter of drawing.

Darkness is absence of light. Shadow is diminution of light.

The mole has very small eyes and it always lives under ground; and it lives as long as it is in the dark but when it comes into the light it dies immediately, because it becomes known;--and so it is with lies.