There is just this excuse for Hartley, whatever it may be worth, that the weakness was hereditary. We do not as yet know, it seems most likely that we shall never know, the precise character of his father. But with all the discrepancy concerning the details, enough for our purpose is certain of the outline. We know that he lived many and long years a prey to weaknesses and vice of this very description; and though it be false and mischievous to speak of hereditary vice, it is most true and wise to observe the mysterious fact of hereditary temptation. Doubtless it is strange that the nobler emotions and the inferior impulses, their peculiar direction or their proportionate strength, the power of a fixed idea—that the inner energy of the very will, which seems to issue from the inmost core of our complex nature, and to typify, if anything does, the pure essence of the immortal soul—that these and such as these should be transmitted by material descent, as though they were an accident of the body, the turn of an eyebrow or the feebleness of a joint,—if this were not obvious, it would be as amazing, perhaps more amazing, than any fact which we know; it looks not only like predestinated, but even heritable election. But, explicable or inexplicable—to be wondered at or not wondered at—the fact is clear; tendencies and temptations are transmitted even to the fourth generation both for good and for evil, both in those who serve God and in those who serve Him not. Indeed, the weakness before us seems essentially connected—perhaps we may say on a final examination essentially identical—with the dreaminess of mind, the inapprehensiveness of reality which we remarked upon before. Wordsworth used to say, that ‘at a particular stage of his mental progress he used to be frequently so wrapt into an unreal transcendental world of ideas, that the external world seemed no longer to exist in relation to him, and he had to convince himself of its existence by _clasping a tree_ or something that happened to be near him.’ But suppose a mind which did not feel acutely the sense of reality which others feel, in hard contact with the tangible universe; which was blind to the distinction between the palpable and the impalpable, or rather lived in the latter in preference to, and nearly to the exclusion of, the former. What is to fix such a mind, what is to strengthen it, to give it a fulcrum? To exert itself, the will, like the arm, requires to have an obvious and a definite resistance, to know where it is, why it is, whence it comes, and whither it goes. ‘We are such stuff as dreams are made of,’ says Prospero. So, too, the difficulty of Shakespeare’s greatest dreamer, Hamlet, is that he cannot quite believe that his duty is to be done where it lies, and immediately. Partly from the natural effect of a vision of a spirit which is not, but more from native constitution and instinctive bent, he is for ever speculating on the reality of existence, the truth of the world.