Stress is the spice of life.

The builder of the best racing car is not necessarily its best driver.

To remain healthy a man must have some goal, some purpose in life that he can respect and be proud to work for.

The element of chance in basic research is overrated. Chance is a lady who smiles only upon those few who know how to make her smile.

I doubt that Fleming could have obtained a grant for the discovery of penicillin on that basis [a requirement for highly detailed research plans] because he could not have said, 'I propose to have an accident in a culture so that it will be spoiled by a mould falling on it, and I propose to recognize the possibility of extracting an antibiotic from this mould.'

As much as we thirst for approval we dread condemnation.

My advice to any young person at the beginning of their career is to try to look for the mere outlines of big things with their fresh, untrained and unprejudiced mind.