For this reason I, Paul, the prisoner of Christ Jesus for the sake of you Gentiles— 2 Surely you have heard about the administration of God’s grace that was given to me for you, 3 that is, the mystery made known to me by revelation, as I have already written briefly. 4 In reading this, then, you will be able to understand my insight into the mystery of Christ, 5 which was not made known to people in other generations as it has now been revealed by the Spirit to God’s holy apostles and prophets. 6 This mystery is that through the gospel the Gentiles are heirs together with Israel, members together of one body, and sharers together in the promise in Christ Jesus
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18 may have power, together with all the Lord’s holy people, to grasp how wide and long and high and deep is the love of Christ, 19 and to know this love that surpasses knowledge—that you may be filled to the measure of all the fullness of God
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18 may have power, together with all the Lord’s holy people, to grasp how wide and long and high and deep is the love of Christ, 19 and to know this love that surpasses knowledge—that you may be filled to the measure of all the fullness of God
"this love that surpasses knowledge" is the same mistery of which Paul talks in 1 Cor 2:6-11, since also there Paul quotes a scripture where the gnosis is given by the love of God for "whom he loves".
But then why does this mistery is described as having "the breadth and length and height and depth" ?
So Irenaeus, Epideixis 1:34 :
And because He is Himself the Word of God Almighty, who in His invisible form pervades us universally in the whole world, and encompasses both its length and
breadth and height and depth for by God's Word everything is disposed and administered the Son of God was also crucified in these, imprinted in the form of a cross on the universe; 171 for He had necessarily, in becoming visible, to bring to light the universality of His cross, in order to show openly through His visible form that activity of His: 172 that it is He who makes bright the height, that is, what is in heaven, and holds the deep, which is in the bowels of the earth, and stretches forth and extends the length from East to West, navigating also the Northern parts and the breadth of the South, and calling in all the dispersed from all sides to the knowledge of the Father.
breadth and height and depth for by God's Word everything is disposed and administered the Son of God was also crucified in these, imprinted in the form of a cross on the universe; 171 for He had necessarily, in becoming visible, to bring to light the universality of His cross, in order to show openly through His visible form that activity of His: 172 that it is He who makes bright the height, that is, what is in heaven, and holds the deep, which is in the bowels of the earth, and stretches forth and extends the length from East to West, navigating also the Northern parts and the breadth of the South, and calling in all the dispersed from all sides to the knowledge of the Father.
So the crucifixion was originally for Paul a cosmic crucifixion. Not an earthly crucifixion. To eclipse this fact, Irenaeus has to distinguish the invisible (cosmic) crucifixion from the visible Gospel crucifixion.