The Difference between Interest and Commitment

We all go through Times of Interest and Commitment. Interest might be High and Commitment Low, and vice versa, but what is it that we consider of value, the Interest to do something or our Commitment to do it. Interest in doing something is a just a response to any situation, it is based on one's convenience to complete the said Task. Commitment to something is a never say die attitude, one where nothing less than completion and success matter, no excuses acceptable, under any circumstances. Showing interest in something,doesn't indicate anything even very definitive. But Commitment is acceptance of nothing else but completion of the task. *No is not an Option, is  phrase that engraves in your mind Commitment, and nothing but Total Commitment to the task at hand, Completion of that Task, and Success of that Task in its entirety. Interest on the other hand is a distant second, one without any commitment whatsoever, and Success or Failure is acceptable since no one cares. What is your Commitment??