A woman showed Neville her hands: a week earlier they had been blistered as if with acid, and now there was no scar. It took five days of revision to bring it about, after unnumbered days in which nothing happened. She produced the change in her own body. Neville uses it as the case the rational man cannot take - to the Greek foolishness and to the Jew a stumbling block - because the man of reason cannot believe that one creates by imagination.