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

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

I also take it as granted that every created thing, and consequently the created monad also, is subject to change, and indeed that this change is continual in each one.

The dot was introduced as a symbol for multiplication by Leibniz. On July 29, 1698, he wrote in a letter to Johann Bernoulli: "I do not like X as a symbol for multiplication, as it is easily confounded with x.

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.

The art of discovering the causes of phenomena, or true hypotheses, is like the art of deciphering, in which an ingenious conjecture often greatly shortens the road.

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