The Miracle of St Dominic’s Trial by Fire.
St Dominic founder of the Friars Preachers was challenged by a heretic one day who was preaching the Albigensian doctrine, after debating for some hours they were getting nowhere so the judges submitted Dominic’s statement of the Catholic faith to the ordeal by fire. The fire was started and the heretic was the first to put his work upon the flames, it immediately burst into flames and was destroyed. St Dominic then threw his work of the Catholic doctrine onto the fire, but it instantly leaped back out of the flames as if by some invisible hand, St Dominic threw his work upon the fire a second time, and again it was thrown back out. St Dominic repeated this three times with the same result. The heretic, even after witnessing the miracle, would not alter his mind and left unchanged, but St Dominic went upon his travels – to preach with greater zeal.