Colossians 1:1 Paul, an apostle of Jesus Christ by the will of God
Ephesians 1:1 Paul, an apostle of Jesus Christ by the will of God
Galations 1:1 Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead;)
There is a theme here. Paul was called by GOD. Not instituted by man. Apostle is ἀπόστολος (apostolos) which means to be sent to an appointed place hence a messenger. This calling to be sent was through the will of GOD. What is GOD’s will for everyone’s life? The most famous and remembered scripture. John 3:16. He sent His only begotten Son to redeem man, who then only He would put death under His feet, so that we could have eternal life. Are you called by the will of GOD to be His messenger? Yes. We all are.