Hebrews 12:20

Of us, then, whose also is the Passover, the calling is from above, and ‘our conversation is in heaven,’ as Paul says; ‘For we have here no abiding city, but we seek that which is to come,’ whereto, also, looking forward, we properly keep the feast. ( And again, afterwards: ) Heaven truly is high, and its distance from us infinite; for ‘the heaven of heavens,’ says he, ‘is the Lord’s.’ But not, on that account, are we to be negligent or fearful, as though the way thereto were impossible; but rather should we be zealous. Yet not, as in the case of those who formerly, removing from the east and finding a plain in Senaar, began [to build a tower], is there need for us to bake bricks with fire, and to seek slime for mortar; for their tongues were confounded, and their work was destroyed. But for us the Lord has consecrated a way through His blood, and has made it easy. …

XII. And therefore He came after Christ, that a Comforter should not be lacking unto us; but Another Comforter, that you might acknowledge His co-equality. For this word Another marks an Alter Ego, a name of equal Lordship, not of inequality. For Another is not said, I know, of different kinds, but of things consubstantial. And He came in the form of Tongues because of His close relation to the Word. And they were of Fire, perhaps because of His purifying Power (for our Scripture knows of a purifying fire, as any one who wishes can find out), or else because of His Substance. For our God is a consuming Fire, and a Fire burning up the ungodly; though you may again pick a quarrel over these words, being brought into difficulty by the Consubstantiality. …