What is Paul's whole premise about being in Christ?

Les explains that Paul's whole premise is that when we are in Christ, it makes all the difference in the world. Paul says all things are yours in Christ, and this is the great glory of being in Christ—an unfathomable well of wisdom and knowledge. This follows his point that all of man's wisdom amounts to nothing without God's wisdom, so no one should glory in men. Paul brings it back to the Corinthians' divisions: whether they followed Paul, Apollos, Peter, or the world, life, death, things present, or things to come, all are theirs in Christ. Les also notes Paul's Mars Hill encounter, where the philosophers called him a babbler, though Paul had kernels of truth and they had babble. Later, in Ephesians, Paul prays believers might be filled with God's wisdom and know the height, depth, width, and length—four dimensions, showing spiritually we're already there.