Thirteen years and one month

Thirteen years and one month is not a short period. If someone is on a mission for that long, one can understand how devoted they are to the mission. Sabari, a disciple of Mathanga Mahamuni, waited for 13 years

Bhagavad Githa, Chapter 14 Verse 3

mama yo:nir mahadbramha thasmin garbham dadha:my aham | sambhavas sarwabhu:tha:na:m thatho: bhavathi bha:ratha! || Gunathraya Vibha:ga Yo:gaha, verse 3 Ramanujacharya’s commentary on Bhagavad Githa is called Githa Bhashyam. Today, there are innumerable commentaries on Githa.