Music is a secret arithmetical exercise and the person who indulges in it does not realize that he is manipulating numbers.

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

There are two kinds of truths: those of reasoning and those of fact. The truths of reasoning are necessary and their opposite is impossible; the truths of fact are contingent and their opposites are possible.

Although the world is not perfect, it is yet the best that is possible.

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.

To love is to place our happiness in the happiness of another.