It doesn't pay to say too much when you are mad enough to choke. For the word that stings the deepest is the word that is never spoke, Let the other fellow wrangle till the storm has blown away, then he'll do a heap of thinking about the things you didn't say.
Continuous, unflagging effort, persistence and determination will win. Let not the man be discouraged who has these.
The most essential factor is persistence -- the determination never to allow your energy or enthusiasm to be dampened by the discouragement that must inevitably come.