The Roman Catholic Church does acknowledge the common priesthood that all baptized Christians belong to.
1546 Christ, high priest and unique mediator, has made of the Church "a kingdom, priests for his God and Father."20 The whole community of believers is, as such, priestly. The faithful exercise their baptismal priesthood through their participation, each according to his own vocation, in Christ’s mission as priest, prophet, and king. Through the sacraments of Baptism and Confirmation the faithful are "consecrated to be . . . a holy priesthood."21
Taken from “The Truth About the Devil” from the Notes of Rev. Dominic Syzmanski:
“The Truth About the Devil” was published as a series of articles in Immaculata from May through December, 1973. It was written by the late Fr. Dominic Syzmanski (d. 1951), the founder of Marytown, the national shrine of St. Padre Maximillion Kolbe. Fr. Dominic was assisted journalistically by Fr. Jerome Palmer, O.S.B., then editor of the Grail, St. Meinrad, Ind., and presently Director of the Secular Oblates of St. Benedict in the USA, Fr. Dominic was pastor of St. Anthony Church, Rockford, Ill. At the time and had for years been active as an exorcist. He would admit to friends that he had the gift of detecting Satan’s presence, which he saw as a small blue light.
The manuscript for “The Truth about the Devil” was found recently in a trunk containing Father Dominic’s personal effects that had been stored away after his death. In view of the outbreak of Satanism and of public interest in exorcism, its importance could never be greater.
Exorcism is a command to the demon, given in the name of God to depart from a person, place or thing.
The formula of exorcism as given in the Roman Ritual is not reserved. It can be used by anyone, even by a lay person. There is no prohibition forbidding its use and the Church did not reserve those beautiful prayers, exclusively to the Sacred Ministers.
Exorcism may be solemn or simple; public or private. The exorcism is solemn if it is performed to expel the demon himself; simple if it is performed to curb the influence of the demon.
The Exorcism is public if it is performed by an ordained minister who acts as an Exorcist in the name and by the authority of the Church, in virtue of the powers received in Sacred Ordination. This power over possessed persons cannot be publicly used without special and express permission of the Ordinary. This prohibition is clearly defined in Canon 1151
No. 1: “No one endowed with the power of exorcising is allowed to pronounce an exorcism over a possessed person unless he has obtained special and express permission to do so from the Ordinary.”
Hence, permission is required for solemn public exorcisms over possessed persons. No permission is needed for solemn public exorcisms over homes, field, animals, to places and in all private and simple exorcisms.
The Ordinary to grant this permissions is the Ordinary in whose diocese the exorcisms are performed or the Ordinary of the Priest. If the priest is an exempt religious his major superior may grant the permission.
The Exorcist having obtained the required permission exercises his power received in Sacred Ordination and he acts in the name and authority of the Church, therefore, he must use only the prescribed formula in the Roman Ritual excluding all private formulas, regardless of how pious they may be. The formula prescribed by the Church is self-sufficient, capable of expelling all spirits of darkness, hence private prayers should not be used by the exorcist during the exorcisms.
Exorcism is private, if it is performed not in the name and authority of the Church, but in the name of the expelling person. If some good holy layman would undertake to exclude the devil from a possessed person, he would be performing a solemn private exorcism for which no permission is necessary from the Ordinary. The Church restricts the public use of the power of her Ordained Exorcists, not private persons. What is permitted to a lay person cannot be denied to a priest. When the priest acts as a private person, he should not use the exorcism stole.
Although public exorcisms performed by the authority of the Church are more effective, nevertheless the demon may also be expelled from possessed persons by private exorcisms. Christ has promised not only to His Apostles but to all who will believe in His Name, that they will cast out the devils. “These signs shall follow them that believe; In my name they shall cast out devils; they shall speak with new tongues; they shall take up serpents; and if they shall drink any deadly thing, it shall not hurt them; they shall lay their hands upon the sick, and they shall recover.” Mark XVI, 17-18.