This is something I have on my desk (along with papers and books piled three feet high). Although I don't believe it's an exhaustive list, I like what it says and want to share it with you.
To laugh often and much;
To win the respect of intelligent people and the affection of children;
To earn the appreciation of honest critics and endure the betrayal of false friends;
To appreciate beauty, to find the best in others;
To leave the world a bit better, whether by a healthy child, a garden patch, or a redeemed social condition;
To know even one life has breathed easier because you have lived.
This is to have succeeded.
-Ralph Waldo Emerson