Sutra:
114. iththAl Isvaran AthmAkkaLukkup pathiyAy ninRu rakshikkumenkiRathu.

Meaning:
As the Thirumantra was compared to the holy thread that signifies a marriage, it is shown that Sriman Narayana will be like a husband and watch over the souls.

Sri PBA Swami's Sarartha Deepikai:
What is gathered out of the statement that the Thirumantra is like the holy thread that signifies a marriage?

That Sriman Narayana will be like the husband of the chEtanas that are attached to the Thirumantra and will protect them.