The need for self discipline

"Do you not know that in a race all the runners run, but only one gets the prize? Run in such a way as to get the prize. Everyone who competes in the games goes into strict training. They do it to get a crown that will not last, but we do it to get a crown that will last forever. Therefore I do not run like someone running aimlessly; I do not fight like a boxer beating the air. No, I strike a blow to my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize.
1 Corinthians 9:24-27
New International Version (NIV)

Run the straight race through God’s good grace,
Lift up thine eyes, and seek His face;
Life with its way before us lies,
Christ is the Path, and Christ the Prize.