Like fuel to throw on the fire burning in me to educate our children well, here's one thing John Piper said about Eric Metaxas' biography of Bonhoeffer:
Tell these stories to your children. Tell them with passion. Tell them with tears. Send your children into the world with their eyes sharpened with the bright light of history. Send them ready to name the academic Nietzsches for what they are. Send them with an unflinching Nie wieder! (Never again!) in their hearts. (quoted from this post by Piper, "Tell Your Children What Hitler Did.")