it says nothing, any one with an ailment in my opinion, from the viewpoint of ancient scripture was considered demonized.or sinful. id guess that was their explanation of a misunderstood illness. there seemed to be an awful lot of 'demon possessed' people back then. hmmm why not now?
[I wonder what bug bite or bacteria from contaminated water might have causes so many people to act crazy. maybe rabies?]
I have always strongly felt that mentally challenged persons should have never been required , expected or recommended to go door to door.
along with the frail mentally declining elderly and children
they cannot teach.
after all, the bible does say, not all of you will be teachers.
[ The last thing that would get me to follow a religion would be people with handicaps peddling magazines.]