Nihil est sine ratione. There is nothing without a reason.
All things in God are spontaneous.
It's easier to be original and foolish than original and wise.
To love is to place happiness in the heart of another.
I am so in favor of the actual infinite that instead of admitting that Nature abhors it, as is commonly said, I hold that Nature makes frequent use of it everywhere, in order to show more effectively the perfections of its Author.
In symbols one observes an advantage in discovery which is greatest when they express the exact nature of a thing briefly and, as it were, picture it; then indeed the labor of thought is wonderfully diminished.