You're completely welcome and I'm happy that you saw some value in it. Your military-training analogy is good too. "That which does not kill us makes us stronger" is a powerful concept, but comes with many caveats that are usually overlooked. It is the ability to heal and learn and adapt that is most essential, not the need to challenge, and unfortunately the Nietzschean expression obscures that. The ways in which his ideas were later used should also serve as a stark warning of how dangerous that particular line of thinking can be.