heyaṃ duḥkham anāgatam [YS 2.16]
duḥkham atītam upabhogenātivāhitaṃ na heyapakṣe vartate. vartamānaṃ ca svakṣaṇe bhogārūḍham iti na tat kṣaṇāntare heyatām āpadyate. tasmād yad evānāgataṃ duḥkhaṃ tad evākṣipātrakalpaṃ yoginaṃ kliśnāti netaraṃ pratipattāram. tad eva heyatām āpadyate.
tasmād yad eva heyam ity ucyate tasyaiva kāraṇaṃ pratinirdiśyate ---