Modern reformers, religious and political, have usually retained the classic theory of orthodoxy, namely, that there is one right or true system--democracy and free thought, for instance--which it is the reformer's duty to establish in the place of prevalent abuses. Certainly Luther and Calvin and the doctrinaires of the French revolution only meant to substitute one orthodoxy for another, and what they set forth they regarded as valid for all men and forever. Nevertheless they had a greater success in discrediting the received system than in establishing their own, and the general effect of their reforms was to introduce the modern conception of liberty, the liberty of liberalism. This consists in limiting the prescriptions of the law to a few points, for the most part negative, leaving it to the initiative and conscience of individuals to order their life and conversation as they like, provided only they do not interfere with the same freedom in others. In practice liberal countries have never reached this ideal of peaceful anarchy, but have continued to enforce state education, monogamy, the vested rights of property, and sometimes military service. But within whatever limits, liberty is understood to lie in the individual being left alone, so that he may express his personal impulses as he pleases in word and action. A philosopher can readily see that this liberal ideal implies a certain view about the relations of man in the universe. It implies that the ultimate environment, divine or natural, is either chaotic in itself or undiscoverable by human science, and that human nature, too, is either radically various or only determinable in a few essentials, round which individual variations play _ad libitum_. For this reason no normal religion, science, art, or way of happiness can be prescribed. These remain always open, even in their foundations, for each man to arrange for himself. The more things are essentially unsettled and optional, the more liberty of this sort there may safely be in the world and the deeper it may run.