I want you to consider something: The depth of our maturity in God prepares us to slay giants.
In 1 Samuel 17 we discover that Goliath stood over nine feet tall, was arrayed with heavy armor and taunted the armies of Israel. He was big, skillful and intimidating. No one would stand up to him, except David.
Saul tries to place his armor on David but that does not work. David decides to use what God has given him and, grabbing his shepherd’s staff, he heads to the brook, chooses five smooth stones and approaches Goliath and kills him.