...a distinction must be made between true and false ideas, and that too much rein must not be given to a man's imagination under pretext of its being a clear and distinct intellection.

Taking mathematics from the beginning of the world to the time when Newton lived, what he had done was much the better half.

There never is absolute birth nor complete death, in the strict sense, consisting in the separation of the soul from the body. What we call births are developments and growths, while what we call deaths are envelopments and diminutions.

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

We live in the best of all possible worlds

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

God's relation to spirits is not like that of a craftsman to his work, but also like that of a prince to his subjects.