revelation is not confined

Boyd K. Packer: Should an angel appear and converse with you, neither you nor he would be confined to corporeal sight or sound in order to communicate. For there is that spiritual process, described by the Prophet Joseph Smith, by which pure intelligence can flow into our minds and we can know what we need to know without either the drudgery of study or the passage of time, for it is revelation.

(Ensign, Jan. 1983)