What it will think to its advantage depends mainly on the past habits of its race. Its past and now invisible lives will influence its desires more powerfully than anything it may itself be able to add to the sum of its likes and dislikes; nevertheless, over and above preconceived opinion and the habits to which all are slaves, there is a small salary, or, as it were, agency commission, which each may have for himself, and spend according to his fancy; from this, indeed, income-tax must be deducted; still there remains a little margin of individual taste, and here, high up on this narrow, inaccessible ledge of our souls, from year to year a breed of not unprolific variations build where reason cannot reach them to despoil them; for _de gustibus non est disputandum_.
Here we are as far as we can go. Fancy, which sometimes sways so much and is swayed by so little, and which sometimes, again, is so hard to sway, and moves so little when it is swayed; whose ways have a method of their own, but are not as our ways—fancy, lies on the extreme borderland of the realm within which the writs of our thoughts run, and extends into that unseen world wherein they have no jurisdiction. Fancy is as the mist upon the horizon which blends earth and sky; where, however, it approaches nearest to the earth and can be reckoned with, it is seen as melting into desire, and this as giving birth to design and effort. As the net result and outcome of these last, living forms grow gradually but persistently into physical conformity with their own intentions, and become outward and visible signs of the inward and spiritual faiths, or wants of faith, that have been most within them. They thus very gradually, but none the less effectually, design themselves.
In effect, therefore, Erasmus Darwin and Lamarck introduce uniformity into the moral and spiritual worlds as it was already beginning to be introduced into the physical. According to both these writers development has ever been a matter of the same energy, effort, good sense, and perseverance, as tend to advancement of life now among ourselves. In essence it is neither more nor less than this, as the rain-drop which denuded an ancient formation is of the same kind as that which is denuding a modern one, though its effect may vary in geometrical ratio with the effect it has produced already. As we are extending reason to the lower animals, so we must extend a system of moral government by rewards and punishments no less surely; and if we admit that to some considerable extent man is man, and master of his fate, we should admit also that all organic forms which are saved at all have been in proportionate degree masters of their fate too, and have worked out, not only their own salvation, but their salvation according, in no small measure, to their own goodwill and pleasure, at times with a light heart, and at times in fear and trembling. I do not say that Erasmus Darwin and Lamarck saw all the foregoing as clearly as it is easy to see it now; what I have said, however, is only the natural development of their system.