How do we know that God calls certain people to preach?

God calls certain individuals to preach through a combination of prophecy and the confirmation of leadership within the church. In 1 Timothy 4:14, the Apostle Paul mentions that Timothy received his calling 'through prophecy with the laying on of the hands of the presbytery.' This indicates that the calling to preach is not solely an individual endeavor but is recognized and confirmed by the church community, particularly those in leadership roles. The acknowledgement by others often leads the called individual to a deeper understanding of their role in ministry.