Angels preach the gospel. They help to fulfil and do the work of the covenants of the Father; they help to gather Israel. They bear witness- seen and unseen- to the chosen vessels, who in turn can bear a faithful witness to the residue, meaning to others of our Father’s children. To some they appear in person. To others they whisper and warn and counsel quietly. To some it is given to know. To others it is given to believe on the words of those who know (see D&C 46:13-14).