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

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.'

The healthiest of all human emotions is gratitude.

Nothing erases unpleasant thoughts more effectively than conscious concentration on pleasant ones.

Mental tensions, frustrations, insecurity, aimlessness are among the most damaging stressors, and psychosomatic studies have shown how often they cause migraine headache, peptic ulcers, heart attacks, hypertension, mental disease, suicide, or just hopeless unhappiness.

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.

Adopting the right attitude can convert a negative stress into a positive one.