7 So to keep me from becoming conceited because of the surpassing greatness of the revelations, a thorn was given me in the flesh, a messenger of Satan to harass me, to keep me from becoming conceited.No, this isn't what he's saying at all. He's saying it wasn't a disease but a "spirit" that was attacking Paul spiritually.
"Now since Paul distinctly states that his 'thorn' was the angel of Satan sent to buffet him, a demon spirit sent from Satan to maketrouble for him wherever he went, why should we say it was something else?" pg. 187
Bosworth hasn't lost me but your interpretation of him is what has me lost. He's saying Paul's thorn wasn't a physical disease but an attack from a demonic spiritual entity.
wonder what a messenger of Satan to harass me means?
