A feeling of success.

"To laugh often and much;
To win the respect of intelligent people and the affection of children;
To earn the approbation of honest critics and endure the betrayal of false friends;
To appreciate beauty;
To find the best in others;
To give of one's self;
To leave the world a bit better, whether by a healthy child, a garden patch, or a redeemed social condition;
To have played and laughed with enthusiasm and sung with exultation;
To know even one life has breathed easier because you have lived —
This is to have succeeded."