The scientific spirit, however, the spirit of analysis and abstraction (or of 'Mediation' and 'Reflection'), is not confined in its operations to the physical world. The criticism of ordinary beliefs and conventions has been applied--and applied at an earlier period--to what has been called the Spiritual world, to Art, Religion, Morality, and the institutions of human Society. Under these names the agency of ages, acting by their individual minds, has created organic systems, unities which have claimed to be permanent, inviolable, and divine. Such unities or organic structures are the Family, the State, the works of Art, the forms, doctrines, and systems of Religion, existing and recognised in ordinary consciousness. But in these cases, as in Nature, the reflective principle may come forward and ask what right these unities have to exist. This is the question which the 'Encyclopaedic,' the 'Aufklärung,' the 'Rationalist' and 'Freethinking' theories, raise and have raised in the last century and the present. What is the Family, it is said, but a fiction or convention, which is used to give a decent, but somewhat transparent covering to a certain animal appetite, and its probable consequences? What is the State, and what is Society, but a fiction or compact, by which the weak try to make themselves seem strong, and the unjust seek to shelter themselves from the consequences of their own injustice? What is Religion, it is said, but a delusion springing from the fears and weakness of the crowd, and the cunning of the few, which men have fostered until it has wrapped humanity in its snaky coils? And Poetry, we are assured, like its sister Arts, will perish and its illusions fade away, when Science, now in the cradle, has become the full-grown Hercules. As for Morality and Law, and the like, the same condemnation has been prepared from of old. All of them, it is said, are but the inventions of power and craft, or the phantoms of human imagination, which the strength of positive science and bare facts is destined in no long time to dispel.