Nothing is more important than to see the sources of invention which are, in my opinion more interesting than the inventions themselves.

One cannot explain words without making incursions into the sciences themselves, as is evident from dictionaries; and, conversely, one cannot present a science without at the same time defining its terms.

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

The monad, of which we shall speak here, is nothing but a simple substance which enters into compounds; simple, that is to say, without parts.

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

The present is great with the future.

The pleasure we obtain from music comes from counting, but counting unconsciously. Music is nothing but unconscious arithmetic.