This is a joke. He can't be serious!
David was on an errand for his father, who had sent him to the front lines to deliver food to his brothers. He arrived to find Goliath bellowing from the valley, mocking the God of Israel, blaspheming his Lord that he loved so deeply.
Goliath was a gigantic Philistine—nine feet and six inches of solid muscle, covered in armor. Every day he would taunt the Israelites, shouting, " I will make you a deal. Send someone out to fight me. If he wins, we'll be your servants. But if I win, you will be our servants. Any takers?"
No one wanted to go near him.
Meanwhile, there stood David. Though David was a musician, a poet, and a tenderhearted guy, he also was as tough as nails. When there were threats against his sheep, he took them on. He had killed a lion and a bear. He wasn't afraid. And he wanted to know why someone wasn't responding to Goliath's challenge.
David wasn't intimidated by his giant because he looked at things differently than everyone else. Everyone else saw a giant of a man and, apparently, a small God. David, however, saw a big God. That giant wasn't as threatening to him as he was to the others.
Maybe you have a giant in your life that is taunting you right now. Maybe it is some kind of threat. Maybe it is an unsaved spouse or a prodigal son or daughter. This giant, so to speak, seeks to control you. It seeks to hurt you. It seeks to torment you.
So what should you do? Like David, see God for who He is and your giant for what it is. Call on God and pray for His power. Then attack your giant.