Success and Failure are according to me two faces of the same coin...you either face success or u end up with a failure and each failure is a stumbling block for the next try at success...Same goes for being happy or sad and ofcourse, life is all about being happy, sad, success and failure. This reminds me of a quote by Ralph Waldo Emerson....

" 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 to 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."