Maya Angelou writes to the daughter she never had:
You may not control all the events that happen to you, but you can decide not to be reduced by them. Try to be a rainbow in someone’s cloud. Do not complain. Make every effort to change things you do not like. If you cannot make a change, change the way you have been thinking. You might find a new solution.
Never whine. Whining lets a brute know that a victim is in the neighborhood.
Be certain that you do not die without having done something wonderful for humanity.”