srIman nAthamunigaL aruLich seydhadhu

aviditaviShayAntara: shaTArerupaniShadAmupagAnamAtrabhoga: |
api cha guNavashAttadekasheShI madhurakavihR^idaye mamAvirastu ||

Meaning:

madhurakavi 			- May that Madhurakavi Azhvar,
aviditaviShayAntara: 		- who knows nothing (other than Nammazhvar)
upagAna mAtra bhoga: 		- who derives pleasure in singing only 
upaniShadAm 			- the divine Srisuktis 
shaTAre: 			- of Nammazhvar,
guNavashAt api cha 		- and who through his qualities 
tad eka sheShI 			- has that Nammazhvar as his lord, 
Avirastu 			- enter 
mama hR^idaye 			- my mind.

Vyakhyana Saram:
Madhurakavi Azhvar considers no one other than Nammazhvar, considers the singing of his Thiruvaymozhi only as his pleasure and going beyond that loses himself in the compassion of Nammazhvar and takes him as his lord. Nathamunigal is asking that such Madhurakavi Azhvar be present in his mind always.

aviditaviShayAntara: - Other than Azhvar, Madhurakavi Azhvar's mind goes nowhere ("bhAvo nAnyatra gacchati", "sindhai maRRu onRin thiRaththadhallA", "maRRonRinaik kANAvE"). Here, the other things include Parampadam, the milky ocean, His vibhava avataras and His archa forms.
Madhurakavi Azhvar considers Azhvar as everything - all relationships and all pleasures - "mAtA pitA", "annaiyAy aththanAy", "sarvam yadeva". Just as Azhvar considers Lord Krishna as everything to him ("ellAm kaNNan"), Madhurakavi Azhvar considers Nammazhvar as everything to him.
Azhvar removed other small devatas; Madhurakavi Azhvar is removing the supreme Lord Krishna Himself.
Madhurakavi Azhvar not only seeks Azhvar but also that which is related to Azhvar - namely, his works ("pAvin innisai pAdith thirivanE").

Through aviditaviShayAntara: shaTAre:, Madhurakavi Azhvar's natural servitude to Azhvar is shown; through "api cha guNavashAttadekasheShI" his servitude through seeing Azhvar's qualities is shown.

madhurakavi - Madhurakavi Azhvar's words are so sweet that they bring out that sweetness even in our mouths "aNNikkum amudhURum en nAvukkE".

mamahR^idaye Avirastu - May he reside in my heart that seeks the same acharya nishtai that Madhurakavi Azhvar exhibited.