(Mat 7:12 NIV) So in everything, do to others what you would have them do to you, for this sums up the Law and the Prophets.
This Golden Rule is also useful in helping us to change others. It teaches us to lead by example. If we want to change someone to be kind, we be kind to them first.
Jesus also led by example. To teach His disciples servanthood, He himself became a servant and washed their feet. He wanted to change them by first setting an example Himself.
(John 13:14-15 NIV) Now that I, your Lord and Teacher, have washed your feet, you also should wash one another’s feet. {15} I have set you an example that you should do as I have done for you.