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tataḥ punaḥ śānta-uditau tulya-pratyayau cittasya-ekāgratā-pariṇāmaḥ
Again from that transformation of one-pointedness in the psyche, sameness of quiescent and uprisen psychic activities
tatas - hence, from that
punar - again
śānta - quiescent
udita - uprisen
tulya - sameness
pratyaya - psychic activity; cause; conception, assumption, notion, idea;
citta - psyche (the totality of the human mind, conscious and unconscious); mind; heart
eka - one
grata - pointedness
pariṇāma - transformation