Failure is enriching. It's also important to accept that you'll make mistakes - it's how you build your expertise. The trick is to learn a positive lesson from all of life's negative moments.
The boy who is going to make a great man must not make up his mind merely to overcome a thousand obstacles, but to win in spite of a thousand repulses and defeats.
GNOSTICS, n. A sect of philosophers who tried to engineer a fusion between the early Christians and the Platonists. The former would not go into the caucus and the combination failed, greatly to the chagrin of the fusion managers.
The trouble with Christianity is, not that its failed, but that it's never been tried . . . not that it can't remake the world, but that it's difficult.