Saying you'll do something, is easy. Doing what you say, builds credibility. Making excuses is easy. Taking responsibility, builds your credibility. It is difficult to make much progress, when no one believes you.
Credibility is vital to success.
And credibility is evidenced by your behavior. The truth often hurts. Yet, it is worth the pain. Respect, influence and accomplishment go to those who are strong enough to speak the truth. Winners are confident enough to use the truth.