Sutra:
117. inthavathikArikku rahaSyathrayamum anuSanthEyam.

Meaning:
To such a Srivaishnava, the recitation of the Rahasyatraya is required.

Sri PBA Swami's Sarartha Deepikai:
To the Srivaishnava, the recitation of the Rahasyatraya which builds knowledge and character, is required.