The Malleus Maleficarum by Kramer and Sprenger, 1489, Excerpts
The next step of the Judge should be that, if after being fittingly tortured she refuses to confess the truth; he should have other engines of torture brought before her, and tell her that she will have to endure these if she does not confess. If then she is not induced by terror to confess, the torture must be continued on the second or third day, but not repeated at that present time unless there should be some fresh indication of its probable success.
The Judge should act as follows in the continuation of the torture. If he wishes to find out whether she is endowed with a witch's power of preserving silence, let him take note whether she is able to shed tears when standing in his presence, or when being tortured. For we are taught both by the words of worthy men of old and by our own experience that this is a most certain sign, and it has been found that even if she be urged and exhorted by solemn conjurations to shed tears, if she be a witch she will not be able to weep: although she will assume a tearful aspect and smear her cheeks and eyes with spittle to make it appear that she is weeping; wherefore she must be closely watched by the attendants. But it may be objected that it might suit with the devil's cunning, with God's permission, to allow even a witch to weep; since tearful grieving, weaving and deceiving are said to be proper to women.
After giving her Holy Water to drink, let him again begin to question her, all the time exhorting her as before. And while she is raised from the ground, if she is being tortured in this way, let the Judge read or cause to be read to her the depositions of the witnesses with their names. The Judge shall ask her if she will confess if the witnesses are brought before her. And if she consents, let the witnesses be brought in and stand before her, so that she may be shamed into confessing some of her crimes.
Finally, if he sees that she will not admit her crimes, he shall ask her whether, to prove her innocence, she is ready to undergo the ordeal by red-hot iron. And they all desire this, knowing that the devil will prevent them from being hurt; therefore a true witch is exposed in this manner.