Be master of your petty annoyances and conserve your energies for the big, worthwhile things. It isn't the mountain ahead that wears you out - it's the grain of sand in your shoe.
Even a fool recognizes that there is great sadness in a bucket of tears. But only a wise man thinks to conserve water and use that bucket to wash his car.
Men can know more than their ancestors did if they start with a knowledge of what their ancestors had already learned....That is why a society can be progressive only if it conserves its traditions.