A thorn was given to Paul after his vision of Paradise. God gave it to him to keep him humble. This reminds me of Peter. Soon after Peter confessed that Jesus was the Christ (to which, Jesus commended him and told him that he would be the rock on which the Church shall be built), Jesus told His disciples that He was about to die. Peter replied, “This must not be so.” And to this Peter, who was just greatly commended, Jesus says, “Get behind me, Satan!” Let him who thinks he stands take heed, lest he fall. That is why God gives Paul the thorn. He certainly doesn’t want Paul to fall. Every Christian needs something in his life to keep him humble. I’ve certainly got my own thorns to deal with!