One must know what is action, one must also know what is forbidden action, and one must again know what is inaction. The nature of action is abstruse.
कर्मणो ह्यपि बौद्धव्य बोद्धव्यं च विकर्मणः। अकर्मणश्च बोद्धव्यं गहना कर्मणो गतिः॥