neRi vAsal thAnEyAy ninRAnai aindhu
poRi vAsal pOrkkadhavam sArththi - aRivAnAm
Alamara nIzhal aRam nAlvarkku anRu uraiththa
Alam amar kaNdaththaran

Meaning:

aran 				- Shiva,
Alam amar kaNdaththu 		- who has the Alahala poison in his throat,
anRu 				- at one time
Ala mara nIzhal 		- in the shadow of the banyan tree,
aRam uraiththa			- taught Dharma
nAlvarkku 			- to four sages (Agastya, Daksha, Pulasthya and Kashyapa).
sArththi 			- By closing
pOrk kadhavam 			- the unshuttable doors to
aindhu poRi vAsal 		- the five senses,
aRivAnAm 			- will he understand (he will not)
neri vAsal thAnEyAy ninRAnai 	- the Lord who is both the means and the end.

Vyakhyana Saram:
May be Azhvar cannot experience such an act of the Lord; would Rudra with his great knowledge and capacity to teach others as Dakshinamurthy understand Him? Azhvar replies - "I gained the flawless knowledge by His grace and even I am unable to fathom His greatness; how is it that Rudra, who gained knowledge and power through penance, assume that he can understand Him and even begin to teach others about it?"