In plain words
Amutaṉār, to Rāmānuja: O our Rāmānuja, you entered my mind and pulled out the theft hidden within it [taking the self as my own]; with pains hard even to imagine you outwitted me thoroughly, set me right here on this earth, and made me over to the husband of Tirumakaḷ [Śrī]. Since then no other false thing will fit in my heart.