Some things were necessarily kept hidden/secret BEFORE the Cross, for the following reason (in the bold in v.8):
1Cor2 -
7 No, we speak of the mysterious and hidden wisdom of God,a which He destined for *our glory before time began. 8 None of the rulers of this age understood it. For if they had, they would not have crucified the Lord of glory. 9 Rather, as it is written:
“No eye has seen,
no ear has heard,
no heart has imagined,
what God has prepared for those who love Him.”b
10 But God has revealed it to us by the Spirit. [i.e. what we see recorded in Scripture FOLLOWING His death/resurrection/ascension/exaltation--recall, John 16:12-15 "But WHEN..."]
[" *for OUR glory" (and BEFORE [G4253] time began), speaking of "the Church WHICH IS HIS BODY" (Eph1:20-23 WHEN [as to its existence!])]
1Cor2 -
7 No, we speak of the mysterious and hidden wisdom of God,a which He destined for *our glory before time began. 8 None of the rulers of this age understood it. For if they had, they would not have crucified the Lord of glory. 9 Rather, as it is written:
“No eye has seen,
no ear has heard,
no heart has imagined,
what God has prepared for those who love Him.”b
10 But God has revealed it to us by the Spirit. [i.e. what we see recorded in Scripture FOLLOWING His death/resurrection/ascension/exaltation--recall, John 16:12-15 "But WHEN..."]
[" *for OUR glory" (and BEFORE [G4253] time began), speaking of "the Church WHICH IS HIS BODY" (Eph1:20-23 WHEN [as to its existence!])]