Double Trouble: The End Of The World. The Birth Of Bumpits
A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it.
... a man that goes around with a prophecy-gun ought never to get discouraged; if he will keep up his heart and fire at everything he sees, he is bound to hit something by and by.