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Walter’s escape had been built on his initial conviction that facts could save lives, that information would be the weapon with which he would thwart the Nazi plan to eliminate the Jews. Witnessing the fate of the Czech family camp, and its residents’ immovable faith, despite the evidence all around them, that they would somehow be spared, had led him to understand a more complicated truth: that information is necessary, to be sure, but it is never sufficient. Information must also be believed, especially when it comes to mortal threats. On this, if nothing else, he and Yehuda Bauer might eventually have found common ground: only when information is combined with belief does it become knowledge. And only knowledge leads to action. The French-Jewish philosopher Raymond Aron would say, when asked about the Holocaust, ‘I knew, but I didn’t believe it. And because I didn’t believe it, I didn’t know.
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Jonathan Freedland (The Escape Artist: The Man Who Broke Out of Auschwitz to Warn the World)