Ever heard the saying, "practice what you preach?" That's important. If we say that we're Christians (like Christ), we should be striving to emulate Him. This is a Biblical concept, and Paul related the Christian life to a race, noting the importance of practicing what we preach.
"Do you not know that those who run in a race all run, but only one receives the prize? Run in such a way that you may win. Everyone who competes in the games exercises self-control in all things... I discipline my body and make it my slave, so that, after I have preached to others, I myself will not be disqualified." (1 Cor 9:24-27)
Nothing's worse than running a race and finishing with a "DQ" by your name, so let's practice some self-discipline!
"For the entire Law is fulfilled in in this one word: "You shall love your neighbor as yourself."—Gal 5:14