For religious liberty is not the negative right of being without any particular religion, just as self-government is not anarchy. It is the right of religious communities to the practice of their own duties, the enjoyment of their own constitution, and the protection of the law, which equally secures to all the possession of their own independence. Far from implying a general toleration, it is best secured by a limited one. In an indifferent State, that is, in a State without any definite religious character (if such a thing is conceivable), no ecclesiastical authority could exist. A hierarchical organisation would not be tolerated by the sects that have none, or by the enemies of all definite religion; for it would be in contradiction to the prevailing theory of atomic freedom. Nor can a religion be free when it is alone, unless it makes the State subject to it. For governments restrict the liberty of the favoured Church, by way of remunerating themselves for their service in preserving her unity. The most violent and prolonged conflicts for religious freedom occurred in the Middle Ages between a Church which was not threatened by rivals and States which were most attentive to preserve her exclusive predominance. Frederic II., the most tyrannical oppressor of the Church among the German emperors, was the author of those sanguinary laws against heresy which prevailed so long in many parts of Europe. The Inquisition, which upheld the religious unity of the Spanish nation, imposed the severest restrictions on the Spanish Church; and in England conformity has been most rigorously exacted by those sovereigns who have most completely tyrannised over the Established Church. Religious liberty, therefore, is possible only where the co-existence of different religions is admitted, with an equal right to govern themselves according to their own several principles. Tolerance of error is requisite for freedom; but freedom will be most complete where there is no actual diversity to be resisted, and no theoretical unity to be maintained, but where unity exists as the triumph of truth, not of force, through the victory of the Church, not through the enactment of the State.