This is how [David Irving] approaches the entire topic. He dismisses the evidence of the witnesses' own eyes: whether Jew or Nazi, they made it all up. He sets a standard of proof for his enemies which no human event could ever fully satisfy. And this is a challenge not only to Deborah Lipstadt. ... If Irving is able to dismiss the testimony of tens of thousands of witnesses, where does that leave history? If we can't know this, how can we know that Napoleon fought at Waterloo or that Henry VIII had six wives? How can we know anything?
 (The Guardian, February 5, 2000)