I don’t try to describe the future. I try to prevent it.

The world began without man, and it will end without him.

As natural selection works solely by and for the good of each being, all corporeal and mental endowments will tend to progress toward perfection.

Every man takes the limits of his own vision for the limits of the world.

The less a man knows about the past and the present, the more insecure must prove to be his judgment of the future.