Bhagavad Gita 4.17

कर्मणो ह्यपि बोद्धव्यं बोद्धव्यं च विकर्मणः। अकर्मणश्च बोद्धव्यं गहना कर्मणो गतिः

karmaṇo hyapi boddhavyaṁ boddhavyaṁ cha vikarmaṇaḥ akarmaṇaśh cha boddhavyaṁ gahanā karmaṇo gatiḥ

For verily, the true nature of action enjoined by the scriptures should be known, as well as that of forbidden or unlawful action, and of inaction; the nature of action is hard to understand.

कर्मका तत्त्व भी जानना चाहिये और अकर्मका तत्त्व भी जानना चाहिये तथा विकर्मका तत्त्व भी जानना चाहिये; क्योंकि कर्मकी गति गहन है।