I am not, in any sense, I fan of Emerson, but I recently came across a poem of his that very nearly summarizes my entire outlook on life. Seriously. Read on:
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