Do not boast about tomorrow, for you do not know what a day may bring.

People will not look forward to posterity who never look backward to their ancestors.

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

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.