Verse 44

वासनाया रसाध्यानाद्रागो यस्य न विद्यते ।तस्य चित्तमचित्तत्वं गतं सत्त्वं तदुच्यते

In plain words

He in whom no passion arises from dwelling on the relish of vāsanā — his citta has gone to acittatva; that is what is called sattva.