indeed Simon himself believed, and after his baptism kept close to Philip, utterly astonished to see the signs and striking miracles which were taking place.
Those 'on the rock' are people who on hearing the word welcome it with enthusiasm, but they have no root; they believe for a while and fall away in the hour of trial.
and when they recognized this was the very man who used to sit and beg at the Gate Beautiful, they were lost in awe and amazement at what had happened to him.