One who knows that situations can only impact the body, mind and intellect, but not his self, he remains peaceful in all situations. If something good or bad happens to a person whom we have no connection with, do we feel any joy or sorrow? We do not. That is the kind of understanding a realized meditator has towards his own body, mind and intellect. He does not feel the need to enter the realm of prakriti to change anything. He remains a witness of all these changes. 

Shri Krishna urges us to lead a well balanced and regulated life so that our body can support our spiritual endeavors. He says that one who has a well regulated diet, exercise, conduct and sleep is fit to become a meditator. Meditation destroys sorrow when one leads a regulated life. 
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