There is a reason that the Reformed are not that great at revelations and miracles and angelology and prophecies from one saint or another. They tickle the ears, but don’t build us up. There is a point where the theological speculation can lead into error — Aquinas got there by going Arminian before Arminius and misreading this: unfallen man was in the good graces of God (correct). Fallen man can, by the grace of God, return to him.
But the Fallen Angels have been damned, and their end is stated plainly.
3. But before I begin to treat more fully of the nature of man (chap. 15 and B. 2 c. 1), it will be proper to say something of angels. For although Moses, in accommodation to the ignorance of the generality of men, does not in the history of the creation make mention of any other works of God than those which meet our eye, yet, seeing he afterwards introduces angels as the ministers of God, we easily infer that he for whom they do service is their Creator. Hence, though Moses, speaking in popular language, did not at the very commencement enumerate the angels among the creatures of God, nothing prevents us from treating distinctly and explicitly of what is delivered by Scripture concerning them in other places. For if we desire to know God by his works, we surely cannot overlook this noble and illustrious specimen. We may add that this branch of doctrine is very necessary for the refutation of numerous errors. The minds of many are so struck with the excellence of angelic natures, that they would think them insulted in being subjected to the authority of God, and so made subordinate. Hence a fancied divinity has been assigned them. Manes, too, has arisen with his sect, fabricating to himself two principles–God and the devil, attributing the origin of good things to God, but assigning all bad natures to the devil as their author. Were this delirium to take possession of our minds, God would be denied his glory in the creation of the world. For, seeing there is nothing more peculiar to God than eternity and aujtousiva, i.e. self-existence, or existence of himself, if I may so speak, do not those who attribute it to the devil in some degree invest him with the honour of divinity? And where is the omnipotence of God, if the devil has the power of executing whatever he pleases against the will, and notwithstanding of the opposition of God? But the only good ground which the Manichees have–viz. that it were impious to ascribe the creation of any thing bad to a good God, militates in no degree against the orthodox faith, since it is not admitted that there is any thing naturally bad throughout the universe; the depravity and wickedness whether of man or of the devil, and the sins thence resulting, being not from nature, but from the corruption of nature; nor, at first, did anything whatever exist that did not exhibit some manifestation of the divine wisdom and justice. To obviate such perverse imaginations, we must raise our minds higher than our eyes can penetrate. It was probably with this view that the Nicene Creed, in calling God the creator of all things, makes express mention of things invisible. My care, however, must be to keep within the bounds which piety prescribes, lest by indulging in speculations beyond my reach, I bewilder the reader, and lead him away from the simplicity of the faith. And since the Holy Spirit always instructs us in what is useful, but altogether omits, or only touches cursorily on matters which tend little to edification, of all such matters, it certainly is our duty to remain in willing ignorance.
4. Angels being the ministers appointed to execute the commands of God, must, of course, be admitted to be his creatures, but to stir up questions concerning the time or order in which they were created (see Lombard, lib. 2 dist. 2, sqq.), bespeaks more perverseness than industry. Moses relates that the heavens and the earth were finished, with all their host; what avails it anxiously to inquire at what time other more hidden celestial hosts than the stars and planets also began to be? Not to dwell on this, let us here remember that on the whole subject of religion one rule of modesty and soberness is to be observed, and it is this, in obscure matters not to speak or think, or even long to know, more than the Word of God has delivered. A second rule is, that in reading the Scriptures we should constantly direct our inquiries and meditations to those things which tend to edification, not indulge in curiosity, or in studying things of no use. And since the Lord has been pleased to instruct us, not in frivolous questions, but in solid piety, in the fear of his name, in true faith, and the duties of holiness, let us rest satisfied with such knowledge. Wherefore, if we would be duly wise, we must renounce those vain babblings of idle men, concerning the nature, ranks, and number of angels, without any authority from the Word of God. I know that many fasten on these topics more eagerly, and take greater pleasure in them than in those relating to daily practice. But if we decline not to be the disciples of Christ, let us not decline to follow the method which he has prescribed. In this way, being contented with him for our master, we will not only refrain from, but even feel averse to, superfluous speculations which he discourages. None can deny that Dionysus (whoever he may have been) has many shrewd and subtle disquisitions in his Celestial Hierarchy, but on looking at them more closely, every one must see that they are merely idle talk. The duty of a Theologian, however, is not to tickle the ear, but confirm the conscience, by teaching what is true, certain, and useful. When you read the work of Dionysus, you would think that the man had come down from heaven, and was relating, not what he had learned, but what he had actually seen. Paul, however, though he was carried to the third heaven, so far from delivering any thing of the kind, positively declares, that it was not lawful for man to speak the secrets which he had seen. Bidding adieu, therefore, to that nugatory wisdom, let us endeavour to ascertain from the simple doctrine of Scripture what it is the Lord’s pleasure that we should know concerning angels.
Institutes of the Christian Religion, Book One Chapter 14