In plain words
The poet: The word of Kaṇṇaṉ [the Carama Śloka], who lies on the river's bank [at Kapisthalam on the Kāvēri], the wondrous one who lies on the ocean, rests in my heart; and so I have come to know the means by which neither death [Yama], nor cruel sins, nor ill repute will ever come near me.