Luke 9:46-48
46 They started arguing over which of them would be most famous. 47 When Jesus realized how much this mattered to them, he brought a child to his side. 48 "Whoever accepts this child as if the child were me, accepts me," he said. "And whoever accepts me, accepts the One who sent me. You become great by accepting, not asserting. Your spirit, not your size, makes the difference."

Another way of saying this is: your spirit not your position, makes the difference.