“The word ‘angel’ is used in the scriptures for any heavenly being bearing God’s message. … The scriptures recite numerous instances where an angel appeared personally. Angelic appearances to Zacharias and Mary (see Luke 1) and to King Benjamin and Nephi, the grandson of Helaman (see Mosiah 3:2; 3 Ne. 7:17–18) are only a few examples … .
“But the ministering of angels can also be unseen. Angelic messages can be delivered by a voice or merely by thoughts or feelings communicated to the mind. President John Taylor described ‘the action of the angels, or messengers of God, upon our minds, so that the heart can conceive … revelations from the eternal world’” (Oaks, “Aaronic Priesthood and the Sacrament,” 38–39).