Chapter 11 of the book of Hebrews gives a list of ordinary and the most unlikely people whom God called, and by faith used in mighty ways to deliver Israel.
These are people who do not ‘fit the bill’ or who have been written off by man. How can God show his power through you if you are already mighty? He does not use the qualified; rather he calls the ordinary and qualifies them. Abraham grew up and lived in a pagan background, but he became the father of faith when he obeyed and moved to a place he did not know. Moses was a stammerer and had anger issues, yet he brought the Israelites out of slavery in Egypt.