Dr. Tae Yun Kim teaches that concentration is a discipline. As you discipline your mind through concentration, your mind learns to focus on only what you desire to create.
Concentration means that you will mentally focus on something – an idea, a feeling, a concept – and eliminate everything else from your mental environment.
Concentration requires quietude, perseverance, and self control.
Quote from: The Silent Master Book, by Dr. Tae Yun Kim, of NorthStar and Jung SuWon