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.

Of what use would it be to you, sir, to become King of China on condition that you forgot what you have been? Would it not be the same as if God, at the same time he destroyed you, created a King in China?

Imaginary numbers are a fine and wonderful refuge of the divine spirit almost an amphibian between being and non-being.

Now, as there is an infinity of possible universes in the Ideas of God, and as only one of them can exist, there must be a sufficient reason for God's choice, which determines him toward one rather than another. And this reason can be found only in the fitness, or the degrees of perfection, that these worlds contain, since each possible thing has the right to claim existence in proportion to the perfection it involves.

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

There is nothing waste, nothing sterile, nothing dead in the universe; no chaos, no confusions, save in appearance.

It is worth noting that the notation facilitates discovery. This, in a most wonderful way, reduces the mind's labour.