Success
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.
This is my favorite quote. It's contributed to Ralph Waldo Emerson, but there is some debate about the authenticity of that.