There is a direct connection between the Holy Ghost and priesthood which says that if you have the Holy Ghost, and are acting under its direction, then you have the powers of heaven backing you. But if you have the priesthood by the laying on of hands, even if given by those in authority to do so, and you have not the Holy Ghost or you are not acting under it’s direction, then while you have position in the church, you do not have heavenly power which is true priesthood and God says, “Amen to the priesthood or authority of that man”. (D&C 121)