I hate to always be the last to find something good, but when I do, I must pass it on. Ray Ortland posted this Luther quote today.
The office of preaching is an arduous office, especially when it is like what Paul encountered here [in 2 Corinthians]. I have often said that, if I could come down with good conscience, I would rather be stretched upon a wheel or carry stones than preach one sermon. For anyone who is in this office will always be plagued; and therefore I have often said that the damned devil and not a good man should be a preacher. But we're stuck with it now.
John W. Doberstein, translator, Luther's Works, Volume 51: Sermons I, page 222.