Sāṃkhya Kārikā verse 13

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

sattva - clarity; the quality of puritylaghu - lightnessprakāśa - brightnesscala - agitation. disturbed, unsteadyrajas - excitingguru - teachereva - thustamas - obscuring; mental darkness, ignorance, illusion, error; deprived of the eye's light or sight; darkness, gloomarthatā - objectsvṛtti - fluctuation; modification; turning; set in motion, course of action, behaviour, movement; activity, function; profession