Sāṃkhya Kārikā verse 12

prīti-aprīti-viṣāda-ātmakāḥ prakāśa-pravṛtti-niyamārthāḥ |
anyonya-abhibhava-āśraya-janana-mithuna-vṛttayaḥ ca guṇāḥ ||

viṣāda - despairprakāśa - clearness, brightness, splendour, lustre, light; visible, shining, brightpravṛtti - finer cognition; special cognitionāśraya - correspondence; that to which anything is annexed, or with which anything is closely connected, or on which anything depends or rests; substratumvṛtti - fluctuation; modification; turning; set in motion, course of action, behaviour, movement; activity, function; professionguṇa - attributes of nature; qualities

Commentaries and Reflections

Commentary by Paul Harvey:

The Nature of the three Guṇa are Gratifying, Painful and Depressing,
(they serve) Brightness, Endeavour and Restraint, and are mutually Supressing, Supporting, Producing, Co-existing, Fluctuating.