1 Corinthians 2:7–8 (KJV 1900)
7 But we speak the wisdom of God in a mystery, even the hidden wisdom, which God ordained before the world unto our glory: 8 Which none of the princes of this world knew: for had they known it, they would not have crucified the Lord of glory.
Paul exhorted the church in Corinth to come together and not be divided. Christ is not divided, and neither should they be.
The Gospel of the cross of Christ is for everyone, both Jews and Greeks, and indeed, this is the dispensation of grace that was a mystery (Ephesians 3:2ff).
Before the kingdom comes, God has ordained this period of grace we are now living in. It was hidden from the O.T. saints and prophets. Paul made this grace known and declared salvation is not only for the Jews. A mystery, yet it was God’s wisdom…before the world to our glory by offering all men everlasting life.
Although ordained by God, salvation is an individual choice. Had the princes (rulers) of this world, or age (Greek: aion not cosmos), they would never have crucified the Lord of glory. Why didn’t they know it? Because it was only revealed spiritually. They depended on their own wisdom.
This is Paul’s continuing point to the church–by dividing Christ and depending on human wisdom, we miss the blessings of God.