Krishna reframes the situation entirely. This war, he tells Arjuna, did not come because you went looking for it. It arrived at your door, unsought. And a righteous war that appears on its own — that is like finding the gates of heaven standing wide open before you. Only the most fortunate Kshatriyas ever receive such an opportunity.
Consider a doctor who has trained for decades and one day encounters a crisis where only their skill can save lives. That moment is not a burden — it is the fulfillment of everything they prepared for. Krishna is saying the same to Arjuna: this battlefield is not your misfortune. It is the moment your entire life has been preparing you for.
The word 'apavritam' — wide open — carries a vivid image. The door is not locked, not even ajar. It stands fully open. All Arjuna has to do is walk through.