Life originated in the sea, and about eighty percent of it is still there.

Old men tend to forget what thought was like in their youth; they forget the quickness of the mental jump, the daring of the youthful intuition, the agility of the fresh insight. They become accustomed to the more plodding varieties of reason, and because this is more than made up by the accumulation of experience, old men think themselves wiser than the young.

In life, people will take you at your own reckoning.

Mathematicians deal with large numbers sometimes, but never in their income.

Science doesn't purvey absolute truth. Science is a mechanism... for testing your thoughts against the universe.

It has been my philosophy of life that difficulties vanish when faced boldly.

Why continue? Because we must. Because we have the call. Because it is nobler to fight for rationality without winning than to give up in the face of continued defeats. Because whatever true progress humanity makes is through the rationality of the occasional individual and because any one individual we may win for the cause may do more for humanity than a hundred thousand who hug their superstitions to their breast.