Separation.

I just heard this being said before the beginning of the song Hum Hain Iss Pal Yahaan from the movie Kisna.

"Kabhi Kabhi Hum...
Ek Doosre Ko Kho Kar Bhi Toh...
Pyaar Ko Ooncha Darjaa Dete Hain.
Judaa Reh Kar...
Pyaar Ki Oonchaaiyonko Praapt Karte.
Aur Pyaar Milan Toh Nahin...
Judaai Bhi Toh Ek Pyaar Hain."

My translation of the above excerpt-

Sometimes we...
after losing each other...
give love a high rank.
Being separated...
we reach heights of love.
And love is not a unison...
separation is also a kind of love.