If we were magically shrunk and put into someone's brain while she was thinking, we would see all the pumps, pistons, gears and levers working away and we would be able to describe the workings completely, in mechanical terms, thereby completely describing the thought processes of the brain. But that description would not contain any mention of thought! It would contain nothing but descriptions of pumps, pistons, levers!

I do not conceive of any reality at all as without genuine unity.

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.

He who hasn't tasted bitter things hasn't earned sweet things.

It is a good thing to proceed in order and to establish propositions. This is the way to gain ground and to progress with certainty.

Nihil est sine ratione. There is nothing without a reason.

The world is not a machine. Everything in it is force, life, thought.