@Cecepax
Which prisoners didn't make it out of Vietnam, Stockdale replied:
Oh, that's easy, the optimists. Oh, they were the ones who said, 'We're going to be out by Christmas.' And Christmas would come, and Christmas would go. ... And they died of a broken heart. This is a very important lesson. You must never confuse faith that you will prevail in the end—which you can never afford to lose—with the discipline to confront the most brutal facts of your current reality, whatever they might be.
@Lulz4l1f3 thank you. Saving these words.