▼8:17 They laid their hands upon them, etc: The apostles administered the sacrament of confirmation, by imposition of hands, and prayer; and the faithful thereby received the Holy Ghost. Not but they had received the grace of the Holy Ghost at their baptism: yet not that plenitude of grace and those spiritual gifts which they afterwards received from bishops in the sacrament of confirmation, which strengthened them to profess their faith publicly.(Challoner)