The noblest pleasure is the joy of understanding.

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.

simplicity is the best sophistication

No human investigation can be called real science if it cannot be demonstrated mathematically.

Nature is so delightful and abundant in its variations that among trees of the same kind there would not be found one which nearly resembles another, and not only the plants as a whole, but among their branches, leaves, and fruit, will not be found one which is precisely like another.

The human being, creature of eyes, needs the image.

Thirst will parch your tongue and your body will waste through lack of sleep ere you can describe in words that which painting instantly sets before the eye.