Sāṃkhya Kārikā verse 13

sattvaṃ laghu prakāśakam-iṣṭam-upaṣṭaṃbhakaṃ calaṃ ca rajaḥ |
guru varaṇakam-eva tamaḥ pradīpavat-ca-arthataḥ vṛttiḥ ||

sattva - clarityprakāśa - brightnessrajas - excitingtamas - obscuringvṛtti - fluctuation; turned; set in motion; profession