As soon as Jesus heard the word that was spoken, He said to the ruler of the synagogue, "Do not be afraid; only believe." Mark 5:36 NLT
Nike says "Just Do It." Jesus says "Only Believe." There is a big difference. Jesus requires that we believe in faith and not doubt. Jesus overheard their conversation and he told them not to be afraid. If we are operating in faith, then we should not fear. "Only Believe."