Finally Arjun starts seeing light. And the voice that makes him see that light is the voice of the woman who has loved him so dearly. He understands what is important. For Rungta serpeech is important , it doesn't matter to him whether he lives or dies. But for Reena he matters, doesn't matter if he was not able to summit, his past doesn't concern her, she is willing to accept him for what he is.
Reena's earnest request to accept his past makes Arjun understand what is more valuable in life. He is able to remember his friend, time spend with Reena and the fact that these people are there for him gives him the motivation to come back to life.
Hats of to AG for showing love as the reason for Arjun's comeback and not the fact that he has to summit. Because the message is clear. It is love that makes us want to live. It is love that gives meaning to our lives. it is love that enriches our life.
But I think he will summit, not for himself but for Anjali who he has started considering a friend. Finally not Rungta or his money but a loving relation is what takes Arjun to the summit.