Where is the pasuram in Nalayira Divya Prabantham for the meaning given below?

o. Heart, For so many days, months,years, and innumerable ages, we have gone through so many births. Today without any prior thought, we have attaine Ramanuja, who is filled with love for the Lord of Aththigiri.(what a great fortune)----- I want to know the pasuram for this above meaning in Nalayira Divya prabantham