This is not from the Bollywood song. It's the poem by Sahir Ludhianvi. I had to clarify.

Magar yeh ho na saka aur ab ye aalam hain
Ki tu nahin, tera gham, teri justjoo bhi nahin
Guzar rahi hain kuchh iss tarah zindagi jaise,
Isse kisi ke sahare ki aarzoo bhi nahin

Na koi raah, na manzil, na roshni ka suraag
Bhatak rahin hai andheron main zindagi meri
Inhi andheron main reh jaoonga kabhi kho kar
Main janta hoon meri hum-nafas, magar yoonhi
Kabhi kabhi mere dil main khayal aata hai