Gottfried Wilhelm Leibniz

Every substance is a perpetual living mirror of the universe.

The universe is a machine, but a divine machine.

Truths of reason are necessary and their opposite is impossible; truths of fact are contingent and their opposite is possible.

The principle of sufficient reason, that nothing happens without a reason why it should be so rather than otherwise.

God is the most perfect being, and therefore he must exist.

The soul is a mirror of an indestructible universe.

The true method of discovery is to form hypotheses and then to test them by experiment.

The art of invention is the art of finding the middle term.

The world is a plenum, not a vacuum.

Pre-established harmony.

I am so much in love with wisdom that I am not content with a little of it, but want to possess it all.

This is the best of all possible worlds.

I have never been able to find a satisfactory explanation for the existence of evil in a world created by a perfectly good God.

The monads have no windows through which anything could enter or depart.

I am convinced that the universe is governed by a perfect harmony.

The art of discovering the causes of phenomena is the art of discovering the reasons of things.

The more I learn, the more I realize how much I don't know.

The true method of discovery is to begin with the general and proceed to the particular.

I have always been of the opinion that the human mind is capable of achieving anything it sets its mind to.

The world is a machine, but it is a divine machine.