What does the Bible say about God calling preachers?

In Mark 6, we see Christ calling His apostles to preach, illustrating that God does the calling. This concept is echoed in Romans 10, where it is stated that those who call on the name of the Lord do so because God first called them. Therefore, the essence of the preacher's calling is to proclaim the gospel of Jesus Christ, a divine commission that is not based on human initiative but rather on God's sovereign grace. Preachers are tasked solely with the responsibility of declaring God’s Word, emphasizing that their message should reflect the authority of Scripture.