According to SrIvaishNava sampradAya, there are 18 Rahasya granthas which are considered important. Pillai LokAcAriyar has authored these sacred granthas.
- Mumukkshuppadi
- Tatvatrayam
- arthapancakam
- SrIvacanabhUshaNam
- archirAdi
- prameyasekaram
- prapannaparitrANam
- sArasangraham
- samsAra sAmrAjyam
- navaratnamAlai
- navavidhasambandham
- yAdrucikkappadi
- parandapadi
- Sriyahpatippadi
- TatvaSekharam
- tanidvayam
- tanicaramam
- tanipraNavam