If scientific reasoning were limited to the logical processes of arithmetic, we should not get very far in our understanding of the physical world

Scientific progress on a broad front results from the free play of free intellects, working on subjects of their own choice, in the manner dictated by their curiosity for exploration of the unknown.

Science has a simple faith, which transcends utility... It is the faith that it is the privilege of man to learn to understand, and that this is his mission.

Putting a man in space is a stunt: the man can do no more than an instrument, in fact can do less. There are far more serious things to do than indulge in stunts. . . . I do not discard completely the value of demonstrating to the world our skills. Nor do I undervalue the effect on morale of the spectacular. But the present hullabaloo on the propaganda aspects of the program leaves me entirely cool.

Science can give mankind a better standard of living, better health and a better mental life, if mankind in turn gives science the sympathy and support so essential to its progress.

Fear cannot be banished, but it can be calm and without panic; it can be mitigated by reason and evaluation.

Publication has been extended far beyond our present ability to make real use of the record.