Mans Search for Meaning by Viktor Frankl
A purpose outside of your self will give your life meaning. This could be the love you have for your spouse, children, family. The love you have for your fellow beings, finishing a manuscript you want to share with the world.
As a psychiatrist he survived 4 camps, saying the best of us didn’t make it, but looking back and analyzing the exprience, the suffering was given meaning by a higher purpose. The circumstances refined and exposed the personality. Some became capos, and were worse then the guards, others gave what little they had and comforted others.