In this way Neelameghacarya ( Later Thillasthanam Swamy ) continued his service in Ahobila Mutt. He acquired a wide range of knowledge progressively. One day a Sriviashnava appeared to him in the dream and said " Put to use the wide knowledge acquired for the good of people and promote Srivaishnavism " this made him think and he decided to take up Sanyasahrama . He entered Sanyasahrama on 30th September 1914  with the blessings of  the  then Jeer of Ahobila Mutt . After becoming a Sanyasin , he assumed the name " Sri Satagopa Ramanuja Mahadesikan . But he was popularly referred to as Sri Thillasthanam Swamy. 

After becoming a Sanyasin , Sri Thillasthanam Swamy travelled all over the country and performed Panchasamsakara , delivered lectures and discourses on Srivaishnava philosophy and Srivaishnavite literature. In this way he promoted Srivaishnava culture and traditions of Ahobila Mutt. Sri Thillasthanam Swamy remained an individual Sanyasin ( though he was promoting Ahobila Mutt ) and this enabled him to visit every nook and corner in South India which is really praiseworthy since in those days transport was rather difficult. His ceaseless travels created great interest in people to pursue Srivaishnavite traditions .A large number of people all over South India became his disciples.People of the Mysore State ( Now Karnataka ) had great affection and regard for him. 

Even though Sri Thillasthanam Swamy was carrying out the routines of a  Srivaishnava Sanyasin , what attracted people to him was his profound knowledge and ability to retrieve them spontaneously to meet the challenges or doubts of individuals. On one occasion , when he was in Mysore ,there was difference of opinion amongst the scholars present regarding regarding the  'Prayaschitta' rites prescribed in vedic tenets .( A  Prayaschitta rite is a  corrective rite to undo any shortcomings in the original rite.) Sri Thillasthanam Swamy explained lucidly the efficacy of Prayaschitta rites quoting various sources including commentaries of sages and learned scholars. Indeed all were awe struck at his profound knowledge and efficient presentation. In this way , a large number of people were attracted towards him . Gradually , he became a symbol of authority and all would consult him on every matter like construction of temple , worship procedures at temples , various rituals etc. Similarly , his lectures were also complete .To make students understand principles clearly , he would use parables or other techniques. He worked devotedly to spread Sanathana Dharma and also ensure his students realise  God's  grace. 

He would stay for long periods at Bangalore , and  would conduct his programme of lectures. He would stay at Prasannakrishnaswamy temple , Thulasithottam ,  Majestic , Bangalore. He took great interest in the working of the Prasannakrishnaswamy temple. He organised the worship procedure at the temple , according to Agama and Vedic precepts. He also arranged the installation of  Adivan Satagopan  Mahadesikan  idol at the temple . 

Sri Thillasthanam Swamy's devoted work and scholarship and easy accessibility enlarged his following of admirers and devotees. He continued his programme of promoting  Sanathanadharma , throughout his life. During the last stages of his life , he lived at Srirangam ( Near Tiruchirapalli) in Tamil Nadu . Sri Thillasthanam Swamy attained Brindavanam on May 4th , 1956. ( Brindavanam  Photos ) . 

Thus Sri Thillasthanam Swamy served the cause of Srivaishnava traditions for a full forty two years.