The _Liberty_ is likely to survive longer than anything else that I have written (with the possible exception of the _Logic_), because the conjunction of her mind with mine has rendered it a kind of philosophic text-book of a single truth, which the changes progressively taking place in modern society tend to bring out into ever stronger relief: the importance, to man and society of a large variety in types of character, and of giving full freedom to human nature to expand itself in innumerable and conflicting directions. Nothing can better show how deep are the foundations of this truth, than the great impression made by the exposition of it at a time which, to superficial observation, did not seem to stand much in need of such a lesson. The fears we expressed, lest the inevitable growth of social equality and of the government of public opinion, should impose on mankind an oppressive yoke of uniformity in opinion and practice, might easily have appeared chimerical to those who looked more at present facts than at tendencies; for the gradual revolution that is taking place in society and institutions has, thus far, been decidedly favourable to the development of new opinions, and has procured for them a much more unprejudiced hearing than they previously met with. But this is a feature belonging to periods of transition, when old notions and feelings have been unsettled, and no new doctrines have yet succeeded to their ascendancy. At such times people of any mental activity, having given up their old beliefs, and not feeling quite sure that those they still retain can stand unmodified, listen eagerly to new opinions. But this state of things is necessarily transitory: some particular body of doctrine in time rallies the majority round it, organizes social institutions and modes of action conformably to itself, education impresses this new creed upon the new generations without the mental processes that have led to it, and by degrees it acquires the very same power of compression, so long exercised by the creeds of which it had taken the place. Whether this noxious power will be exercised, depends on whether mankind have by that time become aware that it cannot be exercised without stunting and dwarfing human nature. It is then that the teachings of the _Liberty_ will have their greatest value. And it is to be feared that they will retain that value a long time.