it's better to be crazy on one point and happy, than sane on all points and unhappy.

we middle-aged folk have the education of life, truly; we know the multiplication table of anxieties and sorrows, the subtraction table of loss, the division table of responsibility.

nothing is as conventional as adolescence.

It is useless to deny that, unless one has a genius for imparting knowledge, teaching is a drudgery.

Conscience that isn't hitched up to common sense is a mighty dangerous thing.

Every new truth begins in a shocking heresy.

... when personal happiness conflicts with any great human ideal, the right to claim such happiness is as nothing compared to the privilege of resigning it.