Karika 13

sattvaṁ laghu prakāśakamiṣṭamupaṣṭambhakaṁ calaṁ ca rajaḥ। guru varaṇakamēva tamaḥ pradīpavaccārthatō vr̥ttiḥ ॥13॥

The 'satva' is light, bright, and desirable. Exciting and swiftly moving is the 'rajas'. That only is the 'tamas' which is heavy and enveloping. These qualities illuminate like a lamp and give purpose to the volitions.

'vr̥ttiḥ' is mental act before it manifests in physical form. We will use 'volition' or 'mental act' as an equivalent translation. Important to differentiate between 'vr̥ttiḥ', a mental act and 'karma', a physical act.]