This is a quote-identification, except I don't actually know the quote. So bear with me, please. It's something like

> There is no sin so great that God could not turn it to good.  

*or*

> The greatest trick God played on the devil was turning everything he did to good.

or something like that. (Though the second is obviously colored by *The Usual Suspects*.)

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I suspect it's an aphorism from someone like Balthasar Gracian (not him, though) or Meister Eckhart, or it's a quote from Augustine or Francis (any--pick your favorite), or some famous teacher or commentator summarizing/paraphrasing one of the greats.

I tagged it Catholicism because I'm an American Catholic, and went to a Catholic college, and virtually all of my religious education has been from those sources. The ancient Greeks (not likely, though, for this one!), Church Fathers, monastics, Aquinas, &c. are likely suspects. C.S. Lewis, G.K. Chesterton, Thomas Merton....

I probably heard it at least fifteen years ago, so no need to consider 21st-century sources.

Does this ring a bell? **Is there a notable quote by a notable author/speaker/teacher in Christianity that fits this mold?**