Rage is caused by a conviction, almost comic in its optimistic origins (however tragic in its effects), that a given frustration has not been written into the contract of life.
There is no failure in life. It all depends how you take things. If you are desiring too much - you want to reach too high, and you cannot - then there is frustration and failure. But if you are not desiring anything and you are perfectly happy wherever you are, life is moment-to-moment victory.
The pursuit of perfection is frustrating and a waste of time, because nothing is ever perfect.
The pursuit of excellence is commendable and worthwhile. Therefore strive for excellence not perfection.