A rich man's body is like a premium cotton pillow, white and soft and blank. Ours are different. My father's spine was a knotted rope, and the skin on his chest was so thin that you could see the ribs pressing out against it.

To do mathematics is to explore a universe of ideas, where the only limit is your imagination.

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.