"thanner ilaatha tamil" - source of quote

I am looking for the source of this beautiful quote:

ஓங்க லிடைவந் துயர்ந்தோர் தொழவிளங்கி ஏங்கொலி ஞாலத் திருளகற்றும் - அங்கவற்றுள் மின்னேர் தனியாழி வெங்கதிரொன் றேனையது தன்னேரிலாத தமிழ்.

I've only been able to locate it on two websites, despite much searching. One is the University of Berkeley website, which gives no source, and the other is http://www.penkatali.org/tamillit.html, which cites it to the Thantiyalankaram. However, I have not been able to find the quote in Project Madurai's etext of the Thantiyalankaram. Does anyone know where the quite is actually from? Is it from a commentary on the Thantiyalankaram, or from some other work entirely?

I'll search and let u know.