Music is a secret and unconscious mathematical problem of the soul.

If you have a clear idea of a soul, you will have a clear idea of a form; for it is of the same genus, though a different species.

[Alternate translation:] The Divine Spirit found a sublime outlet in that wonder of analysis, that portent of the ideal world, that amphibian between being and not-being, which we call the imaginary root of negative unity.

Imaginary numbers are a fine and wonderful refuge of the divine spirit almost an amphibian between being and non-being.

All the different classes of beings which taken together make up the universe are, in the ideas of God who knows distinctly their essential gradations, only so many ordinates of a single curve so closely united that it would be impossible to place others between any two of them, since that would imply disorder and imperfection. Thus men are linked with the animals, these with the plants and these with the fossils which in turn merge with those bodies which our senses and our imagination represent to us as absolutely inanimate.

To love is to take delight in happiness of another, or, what amounts to the same thing, it is to account another's happiness as one's own.

The greatness of a life can only be estimated by the multitude of its actions. We should not count the years, it is our actions which constitute our life.