When God works miracles, he does not do it in order to supply the wants of nature, but those of grace. Whoever thinks otherwise, must needs have a very mean notion of the wisdom and power of God.

To love is to be delighted by the happiness of someone, or to experience pleasure upon the happiness of another. I define this as true love.

We should like Nature to go no further; we should like it to be finite, like our mind; but this is to ignore the greatness and majesty of the Author of things.

Music is nothing but unconscious arithmetic.

Why is there anything at all rather than nothing whatsoever?

These principles have given me a way of explaining naturally the union or rather the mutual agreement [conformité] of the soul and the organic body. The soul follows its own laws, and the body likewise follows its own laws; and they agree with each other in virtue of the pre-established harmony between all substances, since they are all representations of one and the same universe.

He who understands Archimedes and Apollonius will admire less the achievements of the foremost men of later times.