It has long seemed ridiculous to me to suppose that the nature of things has been so poor and stingy that it provided souls only to such a trifling mass of bodies on our globe, like human bodies, when it could have given them to all, without interfering with its other ends.

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.

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.

Nothing is necessitated whose opposite is possible.

God, possessing supreme and infinite wisdom, acts in the most perfect manner, not only metaphysically, but also morally speaking, and ... with respect to ourselves, we can say that the more enlightened and informed we are about God's works, the more we will be disposed to find them excellent and in complete conformity with what we might have desired.

Every mind has a horizon in respect to its present intellectual capacity but not in respect to its future intellectual capacity.

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