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.

We may say, that not only the soul (the mirror of an indestructible universe) is indestructible, but also the animal itself is, although its mechanism is frequently destroyed in parts.

Nature does not make leaps.

I do not conceive of any reality at all as without genuine unity.

We should like Nature to go no further; we should like it to be finite, like our mind; but this is to ignore the greatness and majesty of the Author of things.

To love is to be delighted by the happiness of someone, or to experience pleasure upon the happiness of another. I define this as true love.

But in simple substances the influence of one monad over another is ideal only.