Why is it important not to glory in men?

In 1 Corinthians 3:21, Paul instructs believers not to glory in men because all things are ultimately God's. This principle emphasizes that while ministers of the gospel play a crucial role in God's plan, they are merely servants who convey His message. Elevating men risks attributing divine qualities to human beings, thus detracting from the sovereignty and glory of God. The focus should remain on Christ and His work, recognizing that any good that comes through preaching and ministry is a result of God's grace and not man's efforts or status.