Māyā creates a car for you, a carrying conveyance, this body. So that conveyance is according to karma. So if you act piously in this life, then next life you get good body. Ūrdhvaṁ gacchanti sattva-sthā (BG 14.18). Sattva-sthā. If you are in goodness, then, in the modes of goodness, then you are promoted to higher standard of life. Ūrdhvaṁ gacchanti sattva-sthā madhye tiṣṭhanti rājasāḥ. And if you are in passion, then you remain here. And adho gacchanti tāmasāḥ. And if you are ignorant, then you go to animal life or lower grade of life. This is the law of karma.
But instead of improving your karma, karma-kāṇḍīya-vicāra, fruitive activities, if you take to devotional service and simply try to understand what is Kṛṣṇa, then you are no longer within the influence of this good work or bad work. You are transcendental. Immediately after death, tyaktvā dehaṁ punar janma naiti (BG 4.9), you are no more subjected to this gross body . . . (break)
. . . understand Kṛṣṇa. You can understand Kṛṣṇa simply by chanting Hare Kṛṣṇa mantra. Sevonmukhe hi jihvādau (Brs. 1.2.234): simply by your service attitude, to serve Kṛṣṇa, beginning with the tongue. It is very wonderful.