Sāṃkhya Kārikā verse 12

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

viṣāda - despairātmaka - taking the role of our essenceprakāśa - clearness, brightness, splendour, lustre, light; visible, shining, brightpravṛtti - finer cognition; special cognitionniyama - observances; restraint of the mind; a rule or precept; obligation; restraining, checking, holding backartha - purpose, aim; meaning; thing, objectāśraya - 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
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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.