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.

Now this connection or adaption of all created things with each, and of each with all the rest, means that each simple substance has relations which express all the others, and that consequently it is a perpetual living mirror of the universe.

Music is nothing but unconscious arithmetic.

We live in the best of all possible worlds

I am convinced that the unwritten knowledge scattered among men of different callings surpasses in quantity and in importance anything we find in books, and that the greater part of our wealth has yet to be recorded.

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.

In symbols one observes an advantage in discovery which is greatest when they express the exact nature of a thing briefly and, as it were, picture it; then indeed the labor of thought is wonderfully diminished.