I hold that it is only when we can prove everything we assert that we understand perfectly the thing under consideration.

It is God who is the ultimate reason things, and the Knowledge of God is no less the beginning of science than his essence and will are the beginning of things.

To love is to take delight in happiness of another, or, what amounts to the same thing, it is to account another's happiness as one's own.

To love is to place happiness in the heart of another.

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.

Indeed every monad must be different from every other. For there are never in nature two beings, which are precisely alike, and in which it is not possible to find some difference which is internal, or based on some intrinsic quality.

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