Paul and Timothy are writing this letter to tell the parishioners in Corinth about the trouble they had in Asia, where they were sentenced to death, but clearly didn't die, because now they're writing. They credit god and the congregation's prayers for their rescue.
Jesus is coming, but since that might not be for awhile yet, Paul plans to visit Corinth again. He asks them if they think he made a change in his itinerary on a whim? Because he didn't get travel insurance and this is going to cost him an arm and a leg.
Paul has decided this visit won't be as painful as the last one, because they're the only people he knows there, and if they're upset, he won't have anyone to talk to. He is confident they won't do anything to upset him, either. It's like visiting in-laws.
He admits that he was pretty teary when he last wrote, but he only wants to show them how much he loves them. He also tells them that whoever caused all the grief from before hurt them more than he did Paul. Still, the man has been punished by ostracism, so that's enough and now they should forgive him, lest he get depressed.
He also wants to know if they've been forgiving and obedient, because otherwise, Satan will get them. He also informs us that saved people smell nicer to god, but worse to Satan.