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.

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

In whatever manner God created the world, it would always have been regular and in a certain general order. God, however, has chosen the most perfect, that is to say, the one which is at the same time the simplest in hypothesis and the richest in phenomena.

Every soul is as a world apart, independent of everything else except God.

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

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