When you are tired and heading up a steep incline, and have an unknown distance to the place where you can rest, sometimes the wind will start blowing hard. It feels like an immense, heavy hand in your chest, like a continuous slow motion punch removing all the air from your struggling lungs. Your companions on this uphill walk share frightened looks, they are already depressed about the difficulty of the seemingly endless climb.
It will not do to give them a bracing whiff of your own desperation at this time. So you cheerfully have everyone to stop for a moment, turn their backs to the wind, drink some water, rest their legs. They will appreciate this kindness and so will you.
If things get much worse, and finally the expedition is actually doomed, there will be plenty of time to give everyone a bracing whiff of your own desperation. Until that time, remain cheerful, no matter how bracing the whiff of your own desperation may be to you.