The Life of Tondiar Adippodi (VipraNarayana) illustrates how even a sinner could seek The Grace of Bhagavan Shree Narayana and attain the highest salvation.
Tirumalai and Tiruppalli Eluchchi are 2 exquisite contributions of his, symbolizing The Eternal Grace of Bhagavan Shree Narayana.
There is a mistaken impression that ShreeVaishnavism is a preserve of the upper castes and the Alwars represent Brahminism.
Sings Tondiaradippodi "Lord of ShreeRangam, You have instructed all those who know The Vedas, that the devotees who are born of the lowest caste must be told the highest truths for there is much to be learnt from them, for they are your equals....".
Tiruppan Alwar was so beloved of the Lord, that when he was standing in the way of an upper casteman who was proceeding to the river and who wishing to draw his attention, threw a stone on Tiruppan Alwar, found on return to the temple that the Lord was bleeding at the same place where the stone had been carelessly thrown by him and had hit Tiruppan Alwar!