For, O Krishna! the mind is fickle, boisterous, strong, and obstinate; and I think that to restrain it is as difficult as (to restrain) the wind. The Deity said: Doubtless, O you of mighty arms! the mind is difficult to restrain, and fickle. Still, O son of Kunti! it may be restrained by constant practice and by indifference (to worldly objects). It is my belief, that devotion is hard to obtain for one who does not restrain his self. But by one who is self-restrained and assiduous, it can be obtained through (proper) expedients.