Elder Dallin H. Oaks of the Quorum of the Twelve Apostles explained how the ministering of angels is also a part of the promises of the sacramental prayers:
“These ordinances of the Aaronic Priesthood are also vital to the ministering of angels. …
“… Angelic messages can be delivered by a voice or merely by thoughts or feelings communicated to the mind. …
“… Most angelic communications are felt or heard rather than seen. …
“In general, the blessings of spiritual companionship and communication are available only to those who are clean. … Through the Aaronic Priesthood ordinances of baptism and the sacrament, we are cleansed of our sins and promised that if we keep our covenants we will always have His Spirit to be with us. I believe that promise not only refers to the Holy Ghost but also to the ministering of angels, for ‘angels speak by the power of the Holy Ghost; wherefore, they speak the words of Christ’ (2 Nephi 32:3). So it is that those who hold the Aaronic Priesthood open the door for all Church members who worthily partake of the sacrament to enjoy the companionship of the Spirit of the Lord and the ministering of angels” (in Conference Report, Oct. 1998, 50–51; or Ensign, Nov. 1998, 38–39).