Numbers 22:20 And God came unto Balaam at night, and said unto him, If the men come to call thee, rise up, and go with them; but yet the word which I shall say unto thee, that shalt thou do.
In very rare instances such as this, God would have us mortals to understand that He retains the prerogative at all times to be God, in the fullest and highest sense. Yet, for all intents and purposes, on a day-to-day basis, angels are not permitted to appear in their true forms, for if, in the process of decision making, God permitted angels to reveal their true selves, we would be greatly intimidated by their presence, and as such, such manifestations could materially affect our freedom to choose in an untrammeled manner.
For the time being angels are permitted to influence persons in different ways, especially, through the medium of other persons like ourselves. The good angels move upon the righteous to preach the good news of salvation to other persons, and evil angels move upon folks to offer resistance to any such preaching.
However, this second rule of engagement would not remain the case for too much longer, since the Bible specifically tells us that as the final conflict between good and evil ramps up to a crescendo, all the stops would be pulled out and folks can expect increasing, direct interventions, from both the good, and evil angels.
Matthew 24:23 Then if any man shall say unto you, Lo, here is Christ, or there; believe it not. 24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
May God add His blessing to the study of His word. “Good night” and God bless!