Man-made laws assure justice, but a higher law produces love. No code of conduct ever compelled a father to love his children or a husband to show affection to his wife. The law court may force him to provide bread for the family, but it cannot make him provide the bread of love. A good father is obedient to the unenforceable.

Morality cannot be legislated, but behavior can be regulated. Judicial decrees may not change the heart, but the can restrain the heartless. The law cannot make an employer love an employee, but it can prevent him from refusing to hire me because of the color of my skin.

MLK Jr. ibid, p.65-66.