Use the excerpt to answer the question

War alone brings up to its highest tension, all human entry, and push the stamp of nobility upon the peoples, who have courage to meet. All other trials are substitutes, which never really put me in into the position where they had to make the great decision.

The excerpt suggests that war is the ultimate test of human bravery and that it elevates the nobility of those who have the courage to face it. Other trials or challenges in life are seen as mere substitutes that do not truly force individuals into a situation where they have to make significant decisions.