Forgiveness through the mediation of a Priest is opposed to the doctrine that Christ is the only Mediator.

One Mediator redeemed us. The Priest does not redeem us; he is but an accredited agent of the one Mediator. Confession is but one way of applying the mediation of Christ to men even as Baptism is another. And if Baptism is a Sacrament for the destruction of sin which we ourselves did not commit but which we inherit from Adam, another Sacrament is most fitting for the destruction of sins which we do personally commit after our Baptism. Christ certainly thought so, and instituted the Sacrament of Confession. If you believe in one Mediator, so do we; but we listen to that one Mediator and do as He has commanded us.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty