Therefore whoever annuls one of the least of these commandments, and teaches men so, shall be called the least in the kingdom of the heavens; but whoever practices and teaches them, he shall be called great in the kingdom of the heavens.
Whether we shall be great or small in the kingdom of the heavens depends upon whether or not we keep even the least of the commandments of the law. In this verse Christ stressed the fact that if we do not keep all of the least of the commandments of the law, but annul them and teach others to annul them, we shall become the least in the kingdom of the heavens.
In other words, Christ seemed to be saying, “If you would be great in the kingdom of the heavens, you must have the highest standard of morality. If your standard of morality does not reach the standard of the new law, you will be the least in the kingdom of the heavens.” The morality of no other people is as high as that of the kingdom people. Never think that we care only for life and not for morality. Life must have its expression, and the highest life has the highest expression. Morality is simply the expression of life.