Every man hath the right to doubt his task, and to forsake it from time to time; but what he must not do is forget it. Whoever doubteth not himself is unworthy -for in his unquestioning belief in his ability, he commiteth the sin of pride. Blessed are they who go through moments of indecision.
Believing is a fine thing, but placing those beliefs into execution is a test of strength. Many are those who talk like the roar of the sea, gut their lives are shallow and stagnant, like the rotting marshes. Many are those who lift their heads above the mountain tops, but their spirits remain dormant in the obscurity of the caverns.
The secret is here in the present. If you pay attention to the present, you can improve upon it. And, if you improve on the present, what comes later will also be better." -- The Alchemist