I'm reading the wonderful WWII history A Man Called Intrepid by William Stevenson, which details the formation and activities of the British secret service during the war.
Stevenson writes that during the war Eleanor Roosevelt carried in her purse this prayer:
Dear Lord
Lest I continue
My complacent way
Help me to remember
Somewhere out there
A man died for me today
-- As long as there be war
I then must
Ask and answer
Am I worth dying for?
Worthing reflecting on.