Yoga Sūtra Chapter Three verse 12

tataḥ punaḥ śānta-uditau tulya-pratyayau cittasya-ekāgratā-pariṇāmaḥ ||12||

Again from that transformation of one-pointedness in the psyche,
sameness of quiescent and uprisen psychic activities.

tatas - hencepunar - againśānta - quiescentudita - uprisentulya - samenesspratyaya - psychic activitycitta - psyche; mind; hearteka - onegrata - pointednesspariṇāma - transformation