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 - hence, from thatpunar - againśānta - quiescentudita - uprisentulya - samenesspratyaya - psychic activity; cause; conception, assumption, notion, idea;citta - psyche (the totality of the human mind, conscious and unconscious); mind; hearteka - onegrata - pointednesspariṇāma - transformation