In plain words
Amutaṉār: With delusion welling up in them, the debaters of the Āgamas [the Pāśupatas] speak base meanings, a darkness that welled up and wore the world out. So that the world's darkness should go, our Rāmānuja, the surpassing holy one, let his rich and gathered grace well up and poured out the truth that Araṅgaṉ is the Lord of all souls.