The first thing that jumps out in my mind is David versus...

The first thing that jumps out in my mind is David versus Goliath. That's one of the first stories we ever learn as kids. That's one of the most inspirational stories about courage. David stood in the face of terrible odds and defeated the giant. I love reading that story to my boys. Being courageous is doing something isn't easy or fun but you do it because it's the right thing to do.