The more a man knows, the less he talks.
True power and true politeness are above vanity.
The discovery of what is true and the practice of that which is good are the two most important aims of philosophy.
If this is the best of possible worlds, what then are the others?
It is not love that should be depicted as blind, but self-love.
It is with books as with the fires of our grates, everybody borrows a light from his neighbor to kindle his own, which in turn is communicated to others, and each partakes of all.