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

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.'

Indeed, not all attacks-especially the bitter and ridiculing kind leveled at Darwin-are offered in good faith, but for practical purposes it is good policy to assume that they are.

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

Leaders are leaders only as long as they have the respect and loyalty of their followers.

Gratitude is the most important of all human emotions.

Who would enjoy a life of no runs, no hits, no errors?