I have already observed that, owing to the absence of any recognised general principles, liberty is often granted where it should be withheld, as well as withheld where it should be granted; and one of the cases in which, in the modern European world, the sentiment of liberty is the strongest, is a case where, in my view, it is altogether misplaced. A person should be free to do as he likes in his own concerns; but he ought not to be free to do as he likes in acting for another, under the pretext that the affairs of another are his own affairs. The State, while it respects the liberty of each in what specially regards himself, is bound to maintain a vigilant control over his exercise of any power which it allows him to possess over others. This obligation is almost entirely disregarded in the case of the family relations, a case, in its direct influence on human happiness, more important than all others taken together.