The most entertaining surface on earth is the human face.

I am confident of my ability to demonstrate that one can sometimes believe in something and yet not believe in it. Nothing is less fathomable than the systems that motivate our actions.

We cannot remember too often that when we observe nature, and especially the ordering of nature, it is always ourselves alone we are observing.

Once we know our weaknesses they cease to do us any harm.

Non cogitant, ergo non sunt.

If people should ever start to do only what is necessary millions would die of hunger.

Never undertake anything unless you have the heart to ask Heaven's blessing on your undertaking.