Serlo reached out to touch his disciple, and withdrew his hand hastily, scalded by a drop of burning sweat. After seeing this vision, Serlo "converted", spoke these memorable lines, entered the Cistercian Order, and eventually became abbot of L'Aumône.
Serlo extended his hand to make contact with his pupil, but quickly retracted it due to a painful burn from a scalding sweat drop. Following this vision, Serlo "changed his ways", uttered these iconic phrases, joined the Cistercian Order, and eventually rose to become abbot of L'Aumône.