Imaginary numbers are a fine and wonderful refuge of the divine spirit almost an amphibian between being and non-being.
Gottfried LeibnizWe may say, that not only the soul (the mirror of an indestructible universe) is indestructible, but also the animal itself is, although its mechanism is frequently destroyed in parts.
Gottfried LeibnizI hold that it is only when we can prove everything we assert that we understand perfectly the thing under consideration.
Gottfried Leibniz