"Leibniz made his second visit to England. He went incognito to Cambridge, for no purpose other than to have a conversation with Isaac. Which did occur. But as they punted down the Cam, discoursing, I came upon papers in our chambers proving that Isaac had fallen into Arianism, which I saw as an unspeakable heresy. I burned those papers, and with them many of Isaac’s alchemical notes and books—for to me they were all of a piece. To which crime I now confess freely, and offer my repentance, and ask for forgiveness."