Once in a while, Jesus would use someone as a public example. For example, He affirmed the centurion for his faith, admonished the Pharisees for their pride, and commended a poor widow for her generosity.
One day Jesus spotted a destitute woman in the temple. Although she had almost nothing, she put two small coins into the treasury; Jesus singled her out and lauded her example. He even favorably compared her to the rich who gave out of their surplus. God considered her gift nobler than theirs!
Jesus used a strategy called “bell sheep.” When you want to encourage certain behavior, find someone who is doing what you want, and call attention to it. Affirm it. Like a shepherd hanging a bell around the neck of the sheep he wants the flock to follow, encourage others to watch the example of the one doing right. Visual sermons yield far better results than verbal ones.
From the John Maxwell