The light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

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

He who does not understand the supreme certainty of mathematics is wallowing in confusion.

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.

Who would believe that so small a space could contain the images of all the universe?

Patience serves as a protection against wrongs as clothes do against cold. For if you put on more clothes as the cold increases, it will have no power to hurt you. So in like manner you must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.

Avoid studies of which the result dies with the worker.