Great quote – except give credit to Martin Luther – he did stand before the gates of hell, when excommunicated, making those words – which was like pronouncing your own death sentence before Roman Catholic powers that be in the 16th C.
What is courage? We know it by instinct. We see it. We feel it.
Courage is a firefighter standing before the gates of hell unflinching, unyielding with eyes of steel saying, “Here I stand, I can do no other”.