Fr. Luther didn't start out as an archheretic. He started out as an orthodox Catholic priest concerned with corruption in the Catholic Church. Mr. Keating's comments about Fr. Luther concern the time prior to Fr. Luther's falling into heresy.
Perhaps the subtext of Mr. Keating's remark is that the Church does well to deal properly with the current crisis before it leads to the loss of faith, and the embrace of heresy, on the part of large numbers of currently devout Catholics. Perhaps he raises the specter of Fr. Luther to remind us that the consequences of a failure to reform are even greater evil.
Perhaps Mr. Keating appreciates the irony that Fr. Luther was concerned that the scandals and crises of the day would lead to widespread loss of faith, and he, himself, Fr. Luther, ultimately lost his faith as a result, and dragged many down to the loss of faith with him.
Frankly, I think that Frank may have a point here.
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