Verse
सत्त्वं सुखे सञ्जयति रजः कर्मणि भारत ।ज्ञानमावृत्य तु तमः प्रमादे सञ्जयत्युत ॥
sattvaṃ sukhe sañjayati rajaḥ karmaṇi bhāratajñānamāvṛtya tu tamaḥ pramāde sañjayatyuta
Sattwa attaches to happiness, rajas to action, O Bharata; tamas covers up the knowledge and attaches to negligence of error and inaction.
Gītā 14·9