One of the main tools that that Sri Anna uses to spread Bagavatha Dharma is Upanyasam, i.e discourses on a wide range of topics.
Sri Sri Anna’s vast expanse of knowledge in Sri Vaishnavism takes shape in these discourses. Beyond knowledge of mere theology, it is His deep bhakthi like Alwars and his association with All Perumals that are brought out through these discourses. Sharanagati is the path and Sri Anna brings out the message in His discourses on 4000 Divya Prabandams and treatises of Vaishnava Acharyas. If one wants to understand the real bhavams or feelings of Alwars then he must listen to these upanyasams.