याद किया दिल ने, कहाँ हो तुम?

In this song, the female lover expresses her feeling thus: ...

... मतलबी जहां, मेहरबान हो तुम

Don't we all value selfless behavior, romance or otherwise?

ये ज़िन्दगी उसीकी है, जो किसी का हो गया

"The world is that person's, who belongs to someone else, gets 'lost' in love." In other words, if you are not loved for any reason, it can be very lonely and can give rise to all sorts of desperation.

Ultimately, while union with a lover and, by implication, with God is what is desired by everyone, it takes a skillful poet to bring that about in words, and a beautiful voice like what Lata Mangeshkar and Shreya Ghoshal have, to impart melody.