The monad, of which we shall speak here, is nothing but a simple substance which enters into compounds; simple, that is to say, without parts.

Justice is charity in accordance with wisdom.

Music is the pleasure the human mind experiences from counting without being aware that it is counting.

Indeed in general I hold that there is nothing truer than happiness, and nothing happier and sweeter than truth.

Reality cannot be found except in One single source, because of the interconnection of all things with one another. I maintain also that substances, whether material or immaterial, cannot be conceived in their bare essence without any activity, activity being of the essence of substance in general.

What is is what must be.

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.