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 anyone 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 this out 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 exposing 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.[4]

The first of my books in which her share was conspicious was the
_Principles of Political Economy_. The _System of Logic_ owed little to
her except in the minuter matters of composition, in which respect my
writings, both great and small, have largely benefited by her accurate
and clear-sighted criticism.[5] The chapter of the _Political Econon