Who gave Paul his thorn in 2 Corinthians 12? It might sound like a slightly obscure, angels-on-a-pinhead question, but it is actually very significant, because it cuts to the heart of questions about divine sovereignty, suffering, goodness and the agency of the devil. Does God send adversity, to teach us or bring us to maturity? Do God and Satan work together, in some weird way? Is Satan able to act on his own initiative? Does God sometimes actively will for people to experience things they find painful, that good may result? You get the idea.