Pasuram:

endhai thandhai thandhai thandhai tham mUththappan EzhpadikAl thodangki
vandhu vazhi vazhiyAt seyginROm thiruvONath thiruvizhavil
andhiyam pOdhil ari uruvAgi ariyai azhiththavanai
pandhanai thIrap pallANdu pallAyiraththANdu enRu pAdudhumE

Meaning:

Ezh padi kAl thodangki 		- For seven generations
endhai 				- starting with me and my father,
thandhai 			- his father,
thandhai 			- his father,
thandhai 			- his father,
tham mUththappan 		- his father and grandfather,
vandhu 				- we come (at the right moment to perform mangalashasanam)
vazhi vazhi 			- in the proper way
At seyginROm 			- and perform services.
pallANdu pallAyiraththANdu
  enRu pAdudhum 		- We will perform mangalashasanam to Him for all time
pandhanai thIra 		- to remove the shiver (of being just born) / to remove the fatigue (of having just killed Hiranya),
ari uruvAgi 			- who in the form of Narasimha
azhiththavanai 			- killed
ariyai 				- the enemy (Hiranya, of His devotee Prahlada)
thiruvONath thiruvizhavil 	- on the divine day of Thiruvonam (Sravanam),
andhiyam pOdhil 		- at the dusk time (when the strength of asuras grows).

Vyakhyana Saram:
In spite of knowing the vast difference between those who seek Him for Himself and those who seek Him for other purposes, why did Azhvar invite the latter immediately after inviting the former to join him in performing mangalashasanam? He did that because of His high nature of accepting everyone equally ("udArA: sarva evaite") and the inevitable relationship between Him and everyone ("undhannOdu uravEl namakku ingku ozhikka ozhiyAdhu"), such that no one needs to back out.

In this pasuram, those who have no purpose other than Him, come and join Azhvar while speaking of their nature and their tendencies due to that nature. In the third pasuram, Azhvar refered to the greatness of his kind by saying "EzhAtkAlum pazhippilOm" while talking to those who seek other things. Those who are now joining Azhvar mention the same qualification ("Ezh padi kAl thodangki ...") while joining him. Is it alright for sAttvikas to claim their own greatness? They are doing this not out of ego, but to remove the fear in Azhvar's heart - the fear that those who seek other things might be joining him. This is similar to Hanuman explaining his prowess to remove the fear of Sugreeva and the other vanaras.