The act of having to keep the mind focused as it wanders is a wonderful type of exercise for the mind. The mind is free flowing all day long. Just like anything worth accomplishing in life, it takes discipline to try to focus the mind on the mantra. The mind is so clever that it runs off to another thought and can be gone for a while before we realize that it’s gone. The Bhagavad Gita explains: From wherever the mind wanders due to its flickering and unsteady nature, one must certainly withdraw it and bring it back under the control of the self.