Accordingly, when an exorcist was ordained the Bishop was directed to give him the book in which the exorcisms were written, with the words, “Receive thou these, and commit them to memory, and have thou power to lay hands upon the Energumens, whether they be baptized or only Catechumens Fourth Council of Carthage, Can. 7 (a.d. 398)..”  Though this Canon speaks only of exorcising Energumens, or such persons as were supposed to be possessed by evil spirits, we must remember that the power of such spirits was believed to extend to the whole world outside the Christian Church.  Thus all converts from Paganism and Judaism, and even the children of Christian parents were exorcised before being baptized.  The practice was closely connected with the doctrine of original sin, as we see in many passages of S. Augustine, and is declared by him to be very ancient and universal De Nupt. et Concup. II. § 33:  de Pecc. Orig. § 45; contra aulian Pelag. VI. § 11; Op. Imperf. c. Julian. I. § 50; III. § 144, &c..  In expounding the Creed to candidates for Baptism, he says:  “Therefore, as you have seen this day, and as you know, even little children are breathed on and exorcised, that the hostile power of the devil may be driven out of them, which deceived one man in order that he might get possession of all men De Symbolo, § 2.  Cf. Cat. xx. (Myst. ii.) § 2..”