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.

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 healthiest of all human emotions is gratitude.

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.

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.

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

To be totally without stress is to be dead.