There is no argument so cogent not only in demonstrating, the indestructibility of the soul, but also in showing that it always preserves in its nature traces of all its preceding states with a practical remembrance which can always be aroused. Since it has the consciousness of or knows in itself what each one calls his me. This renders it open to moral qualities, to chastisement and to recompense even after this life, for immortality without remembrance would be of no value.

He who hasn't tasted bitter things hasn't earned sweet things.

Nothing is more important than to see the sources of invention which are, in my opinion more interesting than the inventions themselves.

Music is a hidden arithmetic exercise of the soul, which does not know that it is counting.

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.

There are two famous labyrinths where our reason very often goes astray. One concerns the great question of the free and the necessary, above all in the production and the origin of Evil. The other consists in the discussion of continuity, and of the indivisibles which appear to be the elements thereof, and where the consideration of the infinite must enter in.

In my judgment an organic machine new to nature never arises, since it always contains an infinity of organs so that it can express, in its own way, the whole universe; indeed, it always contains all past and present times.