In the first place, there is the sphere of what is called personal liberty--a sphere most difficult to define, but the arena of the fiercest strife of passion and the deepest feelings of mankind. At the basis lies liberty of thought--freedom from inquisition into opinions that a man forms in his own mind[3]--the inner citadel where, if anywhere, the individual must rule. But liberty of thought is of very little avail without liberty to exchange thoughts--since thought is mainly a social product; and so with liberty of thought goes liberty of speech and liberty of writing, printing, and peaceable discussion. These rights are not free from difficulty and dubiety. There is a point at which speech becomes indistinguishable from action, and free speech may mean the right to create disorder. The limits of just liberty here are easy to draw neither in theory nor in practice. They lead us immediately to one of the points at which liberty and order may be in conflict, and it is with conflicts of this kind that we shall have to deal. The possibilities of conflict are not less in relation to the connected right of liberty in religion. That this liberty is absolute cannot be contended. No modern state would tolerate a form of religious worship which should include cannibalism, human sacrifice, or the burning of witches. In point of fact, practices of this kind--which follow quite naturally from various forms of primitive belief that are most sincerely held--are habitually put down by civilized peoples that are responsible for the government of less developed races. The British law recognizes polygamy in India, but I imagine it would not be open either to a Mahommedan or a Hindu to contract two marriages in England. Nor is it for liberty of this kind that the battle has been fought.