When two persons have their thoughts and speculations completely in common; when all subjects of intellectual or moral interest are discussed between them in daily life, and probed to much greater depths than are usually or conveniently sounded in writings intended for general readers; when they set out from the same principles, and arrive at their conclusions by processes pursued jointly, it is of little consequence in respect to the question of originality, which of them holds the pen; the one who contributes least to the composition may contribute most to the thought; the writings which result are the joint product of both, and it must often be impossible to disentangle their respective parts, and affirm that this belongs to one and that to the other. In this wide sense, not only during the years of our married life, but during many of the years of confidential friendship which preceded it, all my published writings were as much my wife’s work as mine; her share in them constantly increasing as years advanced. But in certain cases, what belongs to her can be distinguished, and specially identified. Over and above the general influence which her mind had over mine, the most valuable ideas and features in these joint productions—those which have been most fruitful of important results, and have contributed most to the success and reputation of the works themselves—originated with her, were emanations from her mind, my part in them being no greater than in any of the thoughts which I found in previous writers, and made my own only by incorporating them with my own system of thought. During the greater part of my literary life I have performed the office in relation to her, which from a rather early period I had considered as the most useful part that I was qualified to take in the domain of thought, that of an interpreter of original thinkers, and mediator between them and the public; for I had always a humble opinion of my own powers as an original thinker, except in abstract science (logic, metaphysics, and the theoretic principles of political economy and politics), but thought myself much superior to most of my contemporaries in willingness and ability to learn from everybody; as I found hardly any one who made such a point of examining what was said in defence of all opinions, however new or however old, in the conviction that even if they were errors there might be a substratum of truth underneath them, and that in any case the discovery of what it was that made them plausible, would be a benefit to truth. I had, in consequence, marked out this as a sphere of usefulness in which I was under a special obligation to make myself active: the more so, as the acquaintance I had formed with the ideas of the Coleridgians, of the German thinkers, and of Carlyle, all of them fiercely opposed to the mode of thought in which I had been brought up, had convinced me that along with much error they possessed much truth, which was veiled from minds otherwise capable of receiving it by the transcendental and mystical phraseology in which they were accustomed to shut it up, and from which they neither cared, nor knew how, to disengage it; and I did not despair of separating the truth from the error, and expressing it in terms which would be intelligible and not repulsive to those on my own side in philosophy. Thus prepared, it will easily be believed that when I came into close intellectual communion with a person of the most eminent faculties, whose genius, as it grew and unfolded itself in thought, continually struck out truths far in advance of me, but in which I could not, as I had done in those others, detect any mixture of error, the greatest part of my mental growth consisted in the assimilation of those truths, and the most valuable part of my intellectual work was in building the bridges and clearing the paths which connected them with my general system of thought.¹
¹The steps in my mental growth for which I was indebted to her were far from being those which a person wholly uninformed on the subject would probably suspect. It might be supposed, for instance, that my strong convictions on the complete equality in all legal, political, social and domestic relations, which ought to exist between men and women, may have been adopted or learnt from her. This was so far from being the fact, that those convictions were among the earliest results of the application of my mind to political subjects, and the strength with which I held them was, as I believe, more than anything else, the originating cause of the interest she felt in me. What is true is, that until I knew her, the opinion was in my mind, little more than an abstract principle. I saw no more reason why women should be held in legal subjection to other people, than why men should. I was certain that their interests required fully as much protection as those of men, and were quite as little likely to obtain it without an equal voice in making the laws by which they are to be bound. But that perception of the vast practical bearings of women’s disabilities which found expression in the book on the “Subjection of Women” was acquired mainly through her teaching. But for her rare knowledge of human nature and comprehension of moral and social influences, though I should doubtless have held my present opinions, I should have had a very insufficient perception of the mode in which the consequences of the inferior position of women intertwine themselves with all the evils of existing society and with all the difficulties of human improvement. I am indeed painfully conscious how much of her best thoughts on the subject I have failed to reproduce, and how greatly that little treatise falls short of what would have been if she had put on paper her entire mind on this question, or had lived to revise and improve, as she certainly would have done, my imperfect statement of the case.
Note from KBJ: Many philosophers believe that Mill was a liberal feminist. I make a case (here) that he was a radical feminist.