Sutra:
9. Avai thAn vyApakankaLenRum avyApakankaLenRum iraNdu varkkam.

Meaning:
These manthras are of two kinds. Those that speak of the Lord in His limitless and all pervading form are known as vyApaka manthras. Those that speak of His avatharas, some of His limitless guNas and some of His leelas are known as avyApaka manthras.

Sri PBA Swami's Sarartha Deepikai:
The manthras that speak of the Lord are not all of the same kind. They are broken up as vyApaka manthras and avyApaka manthras. Those that show that the Lord's form is all pervading are grouped as vyApaka manthras. Those that speak of one or a few of His avatharas, His guNas or His leelas are grouped as avyApaka manthras.