Apparently Saunders had described a moment on one of his journeys when he stopped fighting the wind and the cold; when he gave in to the reality of it and felt (not warm, but) a sudden rush of joy.
While I have not crossed the Antarctic – or even braved a bit of it the way you have – I have stood on the top of a mountain above 14,000 feet in biting wind, and experienced that kind of acceptance. And the joy. People say, “suck it up, and get on with it”. But that’s not it. “Bit i det” they say in Norwegian, but that’s not it either. Both of those images involve a kind of bracing, not a relaxing.