Believe, when you are most unhappy, that there is something for you to do in the world. So long as you can sweeten another’s pain, life is not in vain.

The best antidote I know for worry is work. The best cure for weariness is the challenge of helping someone who is even more tired. One of the great ironies of life is this: He or she who serves almost always benefits more than he or she who is served.