The expression means exactly what it says. If you take the time to go the extra mile, then you will learn this important principle that successful people from all over have learned before as well. Do more than what is expected of you. Do more than you promise to do, even when you make promises to yourself. This principle is obvious in many aspects of life and even in nature. Year after year, the species on the earth that work harder to adapt to their surroundings are the species who continue to flourish, while those who don't slowly but surely start to diminish.

Doing so will also build your confidence, and your integrity, until the point where you realize that your success is in your hands. God has a plan for you, but if you don't make the choices to work hard to get there you will never reach your potential.