However, there are all sorts of behaviours in the Bible that might be called mad now, but aren't designated as insanity by the text itself. People see visions of angels going up and down ladders, of fiery chariots and, like Moses, who hears a bush talking, and Balaam the prophet who has a conversation with his donkey, they hear voices of those who cannot be said to be present in any usual sense of the word. They also speak in tongues, as the disciples do at Pentecost. Like madness, the visions, the voices and the speaking in tongues are due to external and usually divine agencies. In a world so permeated with supernatural powers, there are no accidents, and in one so riddled with prophets who went into a frenzy while prophesying many more kinds of behaviour were accepted as normal, at least for a prophet or an inspired person, than would be the case now. John the Baptist, dressed in animal skins and wandering around in the wilderness denouncing his social superiors, was not thought of as a de-institutionalized street person who's gone off his medications, but as a saint. And this was the pattern for mediaeval views of aberrant behaviour if you were acting crazy it was a divine punishment, or else you were possessed, by powers either divine or demonic perhaps aided, in the latter case, by witches.
On the day of Pentecost Christianity faced the world, a new religion, without a history, without a priesthood, without a college, without a people, and without a patron. She had only her two sacraments and her tongue of fire. The latter was her sole instrument of aggression.
Return, O Power of the Pentecost, return to Thy people! Shed down Thy flame on many heads! To us, as to our fathers and to those of the old time before them, give fullness of grace! Without Thee we can do nothing; but filled with the Holy Ghost, the excellency of the power will be of Thee, O God! and not of us.