Translated by Allan Menzies.
Now, I consider that those who are fully and really sons of Abraham are sons of his actions, spiritually understood, and of the knowledge which was made manifest to him. What he knew and what he did appears again in those who are his sons, as the Scripture teaches those who have ears to hear,  "If ye were the children of Abraham, ye would do the works of Abraham." And if it is a true proverb  which says, "A wise man will understand that which proceeds from his own mouth, and on his lips he will bear prudence," then we must at once repudiate some things which have been said about the prophets, as if they were not wise men, and did not understand what proceeded from their own mouths. We must believe what is good and true about the prophets, that they were sages, that they did understand what proceeded from their mouths, and that they bore prudence on their lips. It is clear indeed that Moses understood in his mind the truth (real meaning) of the law, and the higher interpretations of the stories recorded in his books. Joshua, too, understood the meaning of the allotment of the land after the destruction of the nine and twenty kings, and could see better than we can the realities of which his achievements were the shadows. It is clear, too, that Isaiah saw the mystery of Him who sat upon the throne, and of the two seraphim, and of the veiling of their faces and their feet, and of their wings, and of the altar and of the tongs. Ezekiel, too, understood the true significance of the cherubim and of their goings, and of the firmament that was above them, and of Him that sat on the throne, than all which what could be loftier or more splendid? I need not enter into more particulars; the point I aim at establishing is clear enough already, namely, that those who were made perfect in earlier generations knew not less than the Apostles did of what Christ revealed to them, since the same teacher was with them as He who revealed to the Apostles the unspeakable mysteries of godliness. I will add but a few points, and then leave it to the reader to judge and to form what views he pleases on this subject.
 John viii. 39.
 Prov. xvi. 23.
Reference address : https://www.ellopos.net/elpenor/greek-texts/fathers/origen/john-commentary.asp?pg=128