A definite purpose is like a barrel of a rifle, which gives aim and direction to the bullet. Without this barrier to concentrate the expanding power in the cartridge, it would simply flash without moving the bullet. How many miserable failure, might have been a great triumph; how many dwarfs might have been giants; how many a “mute inglorious Milton” has died with all his music in him…
There is no grander sight in the world than that of a young man fired with a great purpose, dominated by one unwavering aim. He is bound to win; the world stands to one side and lets him pass; it always makes way for the man with a will in him.
-excerpt from Successful Achievement
Struggling for Sanity 