eṣhā te ’bhihitā sānkhye buddhir yoge tvimāṁ śhṛiṇu
buddhyā yukto yayā pārtha karma-bandhaṁ prahāsyasi|| 39||

My Understanding : To determine whether your actions are good or bad, you must cultivate a pure heart. To maintain a good heart, surround yourself with nourishing food and a positive environment. When your heart is pure, your actions will benefit those around you. Align your actions with your duties, and you will free yourself from the cycle of karmic relationships. While performing your duties, do not let fear control you, for fear will only bind you to the karmic cycle again and again.