"'My dear Adolf Hitler, this can’t go on much longer; you yourself can’t possibly take any more pleasure in all this killing, that you murder evil men instead of making them better.'"
Eberhard Arnold (1883-1935) on what he would have said to Hitler (having dreamt of the encounter) had the latter ever actually agreed to meet with him. Emmy Barth, An embassy besieged: the story of a Christian community in Nazi Germany (Eugene, OR: Cascade Books/Plough Publishing, 2010), 233, as quoted by Kevin P. Spicer, CSC, in a review of the book published in Central European history 44, no. 4 (December 2011): 755 (754-756).
Granted, I need to read the book itself. But the quotation can be seen in context via Google Books.