Trying Not Enough

We've all seen that classic Star Wars film, The Empire Strikes Back.  And we all remember that corny yet profound line give us by master Yoda, "Do or do not, there is no try."  Too often we get caught up in life giving only a partial effort instead of giving it all we got.  This relates to the gospel and gospel living.  Striving to be more Christ-like requires more than a simple try, but all our might and strength.  There is a short story I want to share about just doing it:

"An army officer called a soldier to him and ordered him to take a message to another officer.  The soldier saluted and said, 'I'll try, sir!  I'll try!'  To this the officer responded: 'I don't want you to try, I want you to deliver this message.'  The soldier, somewhat embarrassed, now replied: 'I'll do the best I can sir.'  At this the officer, now disgusted rejoined with some vigor:  'I don't want you to try and I don't want you to do the best you can.  I want you to deliver this message.'  Now the young soldier, straightening to his full height, approached the matter magnificently, as he thought, when he saluted again and said:  'I'll do it or die sir.'  To this the irate officer responded:  'I don't want you to die, I don't want you to merely do the best you can, and I don't want you to try.  Now the request is a reasonable one; the message is important; the distance is not far; you are able-bodied; you can do what I have ordered.  Now get out of here and accomplish your mission.' "  (Spencer W. Kimball.  The Miracle of Forgiveness.)
The Lord is the same way, he expects us to do.  We may fail and fall from time to time, but that is part of the test, to get back on you feet and keep fighting.
Diligence: industrious, not idle of negligent

In what ways can we be mor diligent and not simply try but do?  Please feel free to respond.