I am the least of all the apostles and not worthy to called an apostle after the way I percuted God's church - 1 Corinthians 15:9
In mercy and grace, God calls, enables to serve, and declares worthliness
Paul voliently persecution of those he would later call his brothers and sisters - 1 Timothy 1:13
Why did God make Paul worthy to serve? It was due entirely to God's grace and goodness
Your worthiness to serve God does not come from any of your talents, abilities, or credentials