Speaking of the mystery revealed by God, that the Gentiles should be fellow heirs (with the Old Testament believers), of the same body, and partakers of His promise in Christ through the gospel, the apostle Paul wrote; of which I became a minister according to the gift of the grace of God given to me by the effective working of His power, Ephesians 3:7.
No man can make himself a minister (lit. servant) of God, because the calling, message, work, and empowering of genuine ministry to and for God are His prerogative alone to give.*
Ministry is not a title, a position, or a vocation. It is a gift from God.
*Notes on Ephesians 3:7 taken from the MacArthur Study Bible NKJV – Copyright 1979, 1980, 1982 by Thomas Nelson Inc. Used by permission. All rights reserved.