There was a citizen of Gaunt who had never been outside the city walls. For some reason or other the magistrate passed an order that he should not go outside. Strange to tell, up to the moment that the command had passed, the man had been perfectly easy, and never thought of passing the line, but as soon as ever he was forbidden to do it, he pined, and sickened, and even died moaning over the restriction.
If a man sees a thing to be law, he wants to break that law. Our nature is so evil, that forbid us to do a thing, and at once we want to do the thing that is forbidden, and in many minds the principle of law instead of leading to purity has even offered opportunities for greater impurity. Although you may point out the way of uprightness to a man, and tell him what is right and what is wrong, with all the wisdom and force of counsel and caution, unless you can give him a heart to choose the right, and a heart to love the true, you have not done much for him.
—Charles H. Spurgeon
Gospel Extracts (Passmore and Alabaster, 1899).