They Can because they Think they Can. A positive attitude is the outward manifestation of a mind that dwells primarily on positive matters. You can do anything if you have enthusiasm. Enthusiasm is the yeast that makes your hopes rise to the stars. Enthusiasm is the sparkle in your eyes, the swing in your gait and the grip of your hand, the irresistable surge of will and energy to execute your ideas.
Enthusiasts are fighters.
They have fortitude. They have staying qualities. Enthusiasm is at the bottom of all progress. With it, there is accomplishment. Without it, there are only alibis.