And another gem..

It isn't the future I am thinking about; the future is simple: there are those who look within, into their souls, and up at the conjunctions of the planets, who would calculate the shape and form of the world and tell you thus exactly what is going to happen. The future is simple. I can hold it in the palm of my hand; and the present is just a matter of endurance, detachment, and a sense of humor. What frightens me is the past. What-is-to-happen is just a matter of talent and mathematics; what-has-already-happened is the slippery many-headed changing demon that eludes all our blows, defeats all our attempts at geometry.