Its our responsibility to believe. Things just did not happen to people in the Bible because they sat there and didn't do anything. They believed God. God requires faith. Anyone can believe there's a God but God is requiring more than that. Believing that not only does He exists but that He will help you in your time of need. (Hebrews 11:6) The story of David and Goliath was one of faith. David would have never tangled with Goliath if he didn't have faith. 1 Samuel 17 paints the story completely from beginning to end of David's faith that the Lord would give him victory over Goliath. A very simple story but very explicit one when we compare our own faith today with David's when we encounter difficulties in our lives. Will we run toward Goliath believing as David did to slay him or will we be afraid like the rest of the Israelite soldiers when we face life's difficulties? I just bet you'll act like David if you read your Bible and decide every story was meant for you today!