A person that focuses on his weaknesses is much like a knife that is being used by it’s broadside. If turned only 90 degrees and used by its sharp edge, the situation changes completely, and it becomes a much more potent tool. 

In many cases, we have strengths within that require only a minor adjustment to surface and be utilized. 

In many cases, our weaknesses are necessary for our strengths to exist; the sharp side would not exist if not for the broad side. Weakness in many cases is necessary.