"Well, if you will allow me to elaborate my metaphor, I conceive that we have a kind of internal sense, like a rudimentary eye, whose nature it is to be sensitive to Good, just as it is the nature of the physical eye to be sensitive to light. But this eye of the soul, being, as I said, rudimentary, does not as yet perceive Good with any clearness or precision, but only in a faint imperfect way, catching now one aspect of it, now another, but never resting content in any of these, being driven on by the impulse to realize itself to ever surer and finer discrimination, with the sense that it is learning its own nature as it learns that of its object, and that it will never be itself a true and perfect organ until it is confronted with the true and perfect Good. And as by the physical eye we learn by degrees to distinguish colours and forms, to separate and combine them, and arrange them in definite groups, and then, going further, after discerning in this way a world of physical things, proceed to fashion for our delight a world of art, in that finer experience becoming aware of our own finer self; so, by this eye of hers, does the soul, by long and tentative effort, learn to distinguish and appraise the Goods which Nature presents to her; and then, still unsatisfied, proceed to shape for herself a new world, as it were, of moral art, fashioning the relations of man to Nature and to his fellow-man under the stress of her need to realize herself, ever creating and ever destroying only to create anew, learning in the process her own nature, yet aware that she has never learnt it, but passing on without rest to that unimagined consummation wherein the impulse that urges her on will be satisfied at last, and she will rest in the perfect enjoyment of that which she knows to be Good, because in it she has found not only her object but herself. Is not this a possible conception?" "I do not say," he replied, "that it is impossible; but I still feel a difficulty." "What is it?" I said, "for I am anxious not to shirk anything." "Well," he said, "you will remember when Parry suggested that the perception of Good might perhaps be an instinct, you objected that instincts conflict one with another, and that we therefore require another faculty to choose between them. Now it seems to me that your own argument is open to the same objection. You postulate some faculty--which perhaps you might as well call an instinct--and this faculty, as I understand you, in the effort to realize itself, proceeds to discriminate various objects as good. But, now, does this same faculty also know that the Goods are good, and which is better than which, and generally in what relations they stand to one another and to the absolutely Good? Or do we not require here, too, another faculty to make these judgments, and must not this faculty, as I said at first, have previously achieved, by some method of its own, a knowledge of Good, in order that it may judge between Goods?"