How do we know that God makes ministers of the New Covenant?

The apostle Paul emphasizes in 2 Corinthians 3:6 that it is God who makes ministers of the New Covenant. He recounts his own experience in Acts 26, where he articulates how he was appointed by Christ to proclaim the gospel. This divine calling serves as a reminder that no theological training or seminary can replace God’s sovereign choice in making a minister. This understanding is rooted in the assurance that true ministry is initiated and sustained by God's grace, confirming that human efforts alone cannot establish spiritual authority.