Dan 3:25

“If, then, neither Moses, nor Elias, nor Ezekiel, who had all many celestial visions, did see God; but if what they did see were similitudes of the splendour of the Lord, and prophecies of things to come; it is manifest that the Father is indeed invisible, of whom also the Lord said, "No man hath seen God at any time." But His Word, as He Himself willed it, and for the benefit of those who beheld, did show the Father's brightness, and explained His purposes (as also the Lord said: "The only-begotten God, which is in the bosom of the Father, He hath declared [Him];" and He does Himself also interpret the Word of the Father as being rich and great); not in one figure, nor in one character, did He appear to those seeing Him, but according to the reasons and effects aimed at in His dispensations, as it is written in Daniel. For at one time He was seen with those who were around Ananias, Azarias, Misael, as present with them in the furnace of fire, in the burning, and preserving them from [the effects of] fire: "And the appearance of the fourth," it is said, "was like to the Son of God." At another time [He is represented as] "a stone cut out of the mountain without hands," and as smiting all temporal kingdoms, and as blowing them away (ventilans ea), and as Himself filling all the earth. Then, too, is this same individual beheld as the Son of man coming in the clouds of heaven, and drawing near to the Ancient of Days, and receiving from Him all power and glory, and a kingdom. "His dominion," it is said, "is an everlasting dominion, and His kingdom shall not perish."”

“"And the form of the fourth is like the Son of God." Tell me, Nebuchadnezzar, when didst thou see the Son of God, that thou shouldst confess that this is the Son of God? And who pricked thy heart, that thou shouldst utter such a word? And with what eyes wert thou able to look into this light? And why was this manifested to thee alone, and to none of the satraps about thee? But, as it is written, "The heart of a king is in the hand of God: "the hand of God is here, whereby the Word pricked his heart, so that he might recognise Him in the furnace, and glorify Him. And this idea of ours is not without good ground. For as the children of Israel were destined to see God in the world, and yet not to believe on Him, the Scripture showed beforehand that the Gentiles would recognise Him incarnate, whom, while not incarnate, Nebuchadnezzar saw and recognised of old in the furnace, and acknowledged to be the Son of God.”

“Nebuchadnezzar, having ordered the three men to be cast into fire, saw a fourth when he looked into the furnace and said, "I see the fourth as the Son of God." He was impious and yet saw apparitions, visions and dreams. Thus, we cannot infer with absolute certainty that the one who has seen visions and dreams and apparitions is truly impious. To be sure, for the devout person, the truth gushes up natural and pure in his mind, and not by way of dreams.”