“Virtue is the habit of acting according to wisdom.”

Music is a hidden arithmetic exercise of the soul, which does not know that it is counting.

Taking mathematics from the beginning of the world to the time when Newton lived, what he had done was much the better half.

In my judgment an organic machine new to nature never arises, since it always contains an infinity of organs so that it can express, in its own way, the whole universe; indeed, it always contains all past and present times.

Everything that is possible demands to exist.

Why is there anything at all rather than nothing whatsoever?

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

Thus God alone is the primary Unity, or original simple substance, from which all monads, created and derived, are produced.

It is God who is the ultimate reason things, and the Knowledge of God is no less the beginning of science than his essence and will are the beginning of things.

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.

To love is to find pleasure in the happiness of others.

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.

Each portion of matter may be conceived of as a garden full of plants, and as a pond full of fishes. But each branch of the plant, each member of the animal, each drop of its humors, is also such a garden or such a pond.

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

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.

Make me the the master of education, and I will undertake to change the world.

It’s easier to be original and foolish than original and wise.