This prompt really brings to mind a lot of memories. The first being the realization from Achilles’ story on how might is only an illusion we all suffer from. Even the mightiest of warriors fall because there’s a heel that got missed out when being blessed with immortality and youth.
And when you really think about it, take away what a man values the most in his life and who is he? He becomes a mere shadow of who he used to be. As humans, we’re naturally attached to things and people. Even if you’re otherwise strong, that’s your Achilles’ heel right there.
Invincible we are not. Humility is both our greatest lesson and teacher.