In his sermon “Big God, Little God” John Ortberg said:

Many years ago I was walking in Newport Beach, a beach in Southern California, with two friends. Two of us were on staff together at a church, and one was an elder at the same church. We walked past a bar where a fight had been going on inside. The fight had spilled out into the street, just like in an old western. Several guys were beating up on another guy, and he was bleeding from the forehead. We knew we had to do something, so we went over to break up the fight. … I don't think we were very intimidating. [All we did was walk over and say,] "Hey, you guys, cut that out!" It didn't do much good.

Then all of a sudden they looked at us with fear in their eyes. The guys who had been beating up on the one guy stopped and started to slink away. I didn't know why until we turned and looked behind us. Out of the bar had come the biggest man I think I've ever seen. He was something like six feet, seven inches, maybe 300 pounds, maybe 2 percent body fat. Just huge. We called him "Bubba" (not to his face, but afterwards, when we talked about him).

Bubba didn't say a word. He just stood there and flexed. You could tell he was hoping they would try and have a go at him. All of a sudden my attitude was transformed, and I said to those guys, "You better not let us catch you coming around here again!" I was a different person because I had great, big Bubba. I was ready to confront with resolve and firmness. I was released from anxiety and fear. I was filled with boldness and confidence. I was ready to help somebody that needed helping. I was ready to serve where serving was required. Why? Because I had a great, big Bubba. I was convinced that I was not alone. I was safe.

If I were convinced that Bubba were with me 24 hours a day, I would have a fundamentally different approach to my life. If I knew Bubba was behind me all day long, you wouldn't want to mess with me. But he's not. I can't count on Bubba.

Again and again, the writers of Scripture pose this question for us: How big is your God? Again and again we are reminded that One who is greater than Bubba has come, and you don't have to wonder whether or not he'll show up. He's always there. You don't have to be afraid. You don't have to live your life in hiding. You have a great, big God, and he's called you to do something, so get on with it!