Sutra:
185. saundharyamantharAyam; kIzhs sonna kainkaryamum appadiyE.

Meaning:
Being engrossed in His divine beauty is an obstacle to the service. The service without the prayer of the nama: is inferior.

Sri PBA Swami's Sarartha Deepikai:
There are also other obstacles to the service. His divine beauty is so great that it can carry away the soul's thought and become an obstacle. The service that was spoken of the in the fourth case before the nama: term, could be like the service between a husband and wife where there is pleasure for both. Therefore, even His divine beauty is an obstacle to the chetana whose goal is performing the true service which is meant for His pleasure alone.