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I've put in so many enigmas and puzzles that it will keep the professors busy for centuries arguing over what I meant, and that's the only way of insuring one's immortality.

Old Professors never die, they just lose their faculties.

Human beings are infinitely worth studying, especially the peculiarities that often go along with outstanding gifts.

We are immortal until our work on earth is done.

If you live long enough, you'll experience everything.

I'm attending to my legacy, making sure that it travels the universe in the best shape I can get it into. For as long as I'm alive, I'll still be its interpreter.

If you don't execute your ideas, they die.

Any relations in a social order will endure, if there is infused into them some of that spirit of human sympathy which qualifies life for immortality.