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

Men are able to assist fortune but not to thwart her. They can weave her designs, but they cannot destroy them.

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

I like the dreams of the future better than the history of the past.

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