Man is perishing. That may be, and if it is nothingness that awaits us let us so act that it will be an unjust fate.

We should try to be the parents of our future rather than the offspring of our past.

The skeptic does not mean him who doubts, but him who investigates or researches, as opposed to him who asserts and thinks that he has found.

Cure yourself of the inclination to bother about how you look to other people. Be concerned only . . . with the idea God has of you.

Science is a cemetary of dead ideas.

Those faults we do not have, do not bother us.

Men shout to avoid listening to one another.