Life is too short to occupy oneself with the slaying of the slain more than once.

The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.

Only one absolute certainty is possible to man, namely that at any given moment the feeling which he has exists.

The Bible has been the Magna Charta of the poor and of the oppressed.

If a little knowledge is dangerous, where is the man who has so much as to be out of danger?

It is not who is right, but what is right, that is of importance.

Thoughtfulness for others, generosity, modesty, and self-respect are the qualities which make a real gentleman or lady.

God give me strength to face a fact though it slay me.

The secret of genius is to carry the spirit of childhood into maturity.

Make up your mind to act decidedly and take the consequences. No good is ever done in this world by hesitation.

Science is simply common sense at its best.

Life is for service.

Whatever God blesses you, enjoy with all gladness.

Fortune frowns as often as he smiles, and you don’t want to be in his line of sight when he does.

An understanding of the natural world and what's in it is a source of not only a great curiosity but great fulfillment.

If you think I'm fast, just wait until you see my nephew Bruno.

It's nice to see that look of alarm on the faces of the others.

The experience of all former ages had shown that of all human governments, democracy was the most unstable, fluctuating and short-lived.

There is no excuse for not catching a ball you can get to.

The ideal visions of one age eventually are seen as its excesses by the next.

True wit, to every man, is that which falls on another.