Sāṃkhya Kārikā verse 13

सत्त्वं लघु प्रकाशकमिष्टमुपष्टम्भकं चलं च रजः । गुरु वरणकमेव तमः प्रदीपवच्चार्थतो वृत्तिः ॥ १३ ॥

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

sattva - clarity; the quality of transparency or purity; luminous; honesty; the quality of goodness; material or elementary substance, entity, matter; nature, disposition of mind; being, existence, entity, realitylaghu - lightness; light in the stomach, easily digested; well, in good health; light, easy, not heavy or difficultprakāśa - clearness, brightness, splendour, lustre, light; visible, shining, brightiṣṭa - wished, desired; liked, beloved; chosenupaṣṭambhaka - strengthening; stimulation; excitingcala - agitation. disturbed, unsteadyca - andrajas - one of the three qualities in Sāṅkhya; exciting; energy, activity, ambition, and passion; it predominates in air, and is active, urgent, and variable; female seed, female generative fluidguru - heavy, weighty; a teacher, preceptor; a spiritual parent or preceptor; any venerable or respectable personvaraṇaka - covering, covering over, concealingeva - indeed, truly, really; thus; so, just so, exactly sotamas - obscuring; mental darkness, ignorance, illusion, error; deprived of the eye's light or sight; darkness, gloom; the obscuration of the sun or moon in eclipsespradīpavat - like a lamparthatā - objectsvṛtti - fluctuation; modification; turning; set in motion, course of action, behaviour, movement; activity, function; profession, mode of life or conduct, course of action, behaviour
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Commentaries and Reflections

Commentary by S Ramaswami:

Sloka 13 is more or less a summary of the previous two Sloka on the nature and apparition of the Guna.

sattvam- Sattva is that which is.
laghu- Lightness of mind and body. Not heavy in body and mind.
prakāśakam- That which illuminates or is illuminating.
iṣṭam- That which is desirable (Sukham).
upaṣṭaṃbhakam- That which is stimulating mentally and physically. I.e. A red rag to a bull.
calam- Physical activity. That which is movement.
ca- And
rajaḥ- Is Rajas.
guru- Heaviness.
varaṇakam- That which envelops and surrounds.
eva- Only that.
tamaḥ- Is Tamas.
pradīpavat- Just like a lamp.
ca- And
arthataḥ- Their object is to (Arthatā)
vṛttiḥ- Function, activity.

Compared to the functioning of a lamp. With the wick, oil and light.
All have to work together, to make the flame give the light.
Sattva can be compared to the light.
RAJAS- oil
TAMAS- wick
All the three Guṇa are present in all things.

It is developing Sattva to understand the nature of Rajas and Tamas, which is important.