Yōga Sūtra 3.12

tataḥ punaḥ śāntōditau tulyapratyayau cittasyaikāgratāpariṇāmaḥ।

Then, again, weighing in on the arousal and paused states of the consciousness, with firm conviction, ēkāgratā-pariṇāmaḥ (Effect-of-One pointed attention) is obtained.