Contrast is the sin-qua-non of existence. There is no quality in this world that is not what it is merely by contrast. Nothing exists in itself.
Contrast is that which gives texture to the world. By shadow only do we perceive that all visible objects are not flat.
Contrast is responsible for the perpetuation of difference — it's from their having stood contrasted that good and bad so long have lasted
Contrast is the sin-qua-non of vision. The eye doesn't in fact see any shapes, it sees only what is differentiated through light and dark or through colors.
Contrast is the background that things need to properly appear. In order for the light to shine so brightly, the darkness must be present.
Contrast is essential to our accurate cognition of our world. We never see the true state of our condition till it is illustrated to us by its contraries, nor know how to value what we enjoy, but by the want of it.
Contrast is a powerful clarifying agent: To depict spring, it has to be in wintertime... to describe a beautiful landscape, one must be enclosed within walls.
Contrast is valuable for it brings things into perspective — He who has not tasted bitter, knows not the sweet.