A scientist is as weak and human as any man, but the pursuit of science may ennoble him even against his will.

I have written 240 books on a wide variety of topics. . . . Some of it I based on education I received in my school, but most of it was backed by other ways of learning - chiefly in the books I obtained in the public library.

Scientists expect to be improved on and corrected; they hope to be

We're forever teetering on the brink of the unknowable, and trying to understand what can't be understood.

Do not forget that a traitor within our ranks, known to us, can do more harm to the enemy than a loyal man can do good to us.

It was childish to feel disappointed, but childishness comes almost as naturally to a man as to a child.

The first step in making rabbit stew is catching the rabbit.