Continuing from the sutra 1.3, in which the writer sums up the whole goal of yoga (to abide in one's true nature), we come to 1.4: Vritti Sarupyam Itaratra "At other times, [the Self seems to] identify with the mind's fluctuations" Vritti = "modifications" (of the chitti, mind-stuff, mentioned in sutra 1.2), sarupyam = "assumes the forms …
Not Abiding: Yoga Sutra 1.4
Yoga Journey 108 