My favorite quote:

People are often unreasonable, illogical, and self-centered;
Forgive them anyway.
If you are kind, people may accuse you of selfish, ulterior motives;
Be kind anyway.
If you are successful, you will win some false friends and some true enemies;
Succeed anyway.
If you are honest and frank, people may cheat you;
Be honest and frank anyway.
What you spend years building, someone could destroy overnight;
Build anyway.
If you find serenity and happiness, they may be jealous;
Be happy anyway.
The good you do today, people will often forget tomorrow;
Do good anyway.
Give the world the best you have,
and it may never be enough;
Give the world the best you've got anyway.
You see, in the final analysis,
it is between you and God;
It was never between you and them anyway.

Mother Teresa