It is necessary to believe that the mixture of evil has produced the greatest possible good: otherwise the evil would not have been permitted.

The present is big with the future, the future might be read in the past, the distant is expressed in the near.

Every present state of a simple substance is the natural consequence of its preceding state, in such a way that its present is big with its future.

Nothing is necessitated whose opposite is possible.

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

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

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

There are also two kinds of truths: truth of reasoning and truths of fact.

Indeed in general I hold that there is nothing truer than happiness, and nothing happier and sweeter than truth.

We live in the best of all possible worlds

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.

A great doctor kills more people than a great general.

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

What is is what must be.

He who understands Archimedes and Apollonius will admire less the achievements of the foremost men of later times.

The words 'Here you can find perfect peace' can be written only over the gates of a cemetery.

Reality cannot be found except in One single source, because of the interconnection of all things with one another.

To love is to place happiness in the heart of another.

The most perfect society is that whose purpose is the universal and supreme happiness.