The equality of married persons before the law, is not only the sole mode in which that particular relation can be made consistent with justice to both sides, and conducive to the happiness of both, but it is the only means of rendering the daily life of mankind, in any high sense, a school of moral cultivation. Though the truth may not be felt or generally acknowledged for generations to come, the only school of genuine moral sentiment is society between equals....Citizenship, in free countries, is partly a school of society in equality; but citizenship fills only a small place in modern life, and does not come near the daily habits or inmost sentiments. The family, justly constituted, would be the real school of the virtues of freedom. It is sure to be a sufficient one of everything else. It will always be a school of obedience for the children, of command for the parents. What is needed is, that it should be a school of sympathy in equality, of living together in love, without power on one side or obedience on the other. This it ought to be between the parents. It would then be an exercise of those virtues which each requires to fit them for all other association, and a model to the children of the feelings and conduct which their temporary training by means of obedience is designed to render habitual, and therefore natural, to them. The moral training of mankind will never be adapted to the conditions of the life for which all other human progress is a preparation, until they practise in the family the same moral rule which is adapted to the normal constitution of human society.
John Stuart Mill, The Subjection of Women, Chapter Two