It thinks itself undying.

So you have thought.

In the first strength of this infatuation your enduring love for Surja Mukhi became invisible to your eyes.

This delusion is inherent in man's nature; therefore I do not censure you, rather I counsel you to strive to be happy in this state.
"Do not despair; Surja Mukhi will certainly return.

How long can she exist without seeing you?
So long as she remains absent, do you cherish Kunda Nandini.