Sutra:
8. Bhagavan manthrankaL thAn anEkankaL.

Meaning:
The manthras that speak of the endless kalyANa guNas of the Lord and the avatharas that exemplify those guNas are limitless.

Sri PBA Swami's Sarartha Deepikai:
Let us accept for a moment that the knowledge obtained via Sastras is a tiring effort and that it is better obtained from manthras. However, is it not true that there are several manthras. Why does one have to use the Thiruvashtakshara manthra alone?

To answer this, Sri Pillai Lokacharya begins by pointing out that there are countless manthras. Then in the next several sutras, he will break up the manthras into two groups, show that we are not interested in the first group and that the Thirumanthra has a special and high status amongst the manthras in the second group.

Sriman Narayana's kalyANa guNas are endless. The avatharas that bring out those kalyANa guNas are also endless. Similarly the manthras that speak of His kalyANa guNas are also endless and so are the manthras that speak of His avatharas. As there is no limit to His guNas or His avatharas, so also there is no limit to the manthras that speak of them.