1. ”Although the whole of this life were said to be nothing but a dream and the physical world nothing but a phantasm, I should call this dream or phantasm real enough, if, using reason well, we were never deceived by it.”
2. “Each portion of matter may be conceived as a garden full of plants, and as a pond full of fish. But every branch of each plant, every member of each animal, and every drop of their liquid parts is itself likewise a similar garden or pond.”
3. “In symbols one observes an advantage in discovery which is greatest when they express the exact nature of a thing briefly and, as it were, picture it; then indeed the labor of thought is wonderfully diminished.”
4. “It is rare to find learned men who are clean, do not stink and have a sense of humour.”
5. "I would walk twenty miles to listen to my worst enemy if I could learn something."
6. “Nothing is more important than to see the sources of invention which are, in my opinion more interesting than the inventions themselves.”
7. "Pleasure is a knowledge or feeling of perfection, not only in ourselves, but also in others, for in this way some further perfection is aroused in us."
8. “The pleasure we obtain from music comes from counting, but counting unconsciously. Music is nothing but unconscious arithmetic.”
9. ”The soul is the mirror of an indestructible universe.”
10. "To love is to place our happiness in the happiness of another."
