THOSE English critics who at the beginning of the present century introduced from Germany, together with some other subtleties of thought transplanted hither not without advantage, the distinction between the Fancy and the Imagination, made much also of the cognate distinction between Wit and Humour, between that unreal and transitory mirth, which is as the crackling of thorns under the pot, and the laughter which blends with tears and even with the sublimities of the imagination, and which, in its most exquisite motives, is one with pity—the laughter of the comedies of Shakespeare, hardly less expressive than his moods of seriousness or solemnity, of that deeply stirred soul of sympathy in him, as flowing from which both tears and laughter are alike genuine and contagious.
This distinction between wit and humour, Coleridge and other kindred critics applied, with much effect, in their studies of some of our older English writers. And as the distinction between imagination and fancy, made popular by Wordsworth,  found its best justification in certain essential differences of stuff in Wordsworth's own writings, so this other critical distinction, between wit and humour, finds a sort of visible interpretation and instance in the character and writings of Charles Lamb;—one who lived more consistently than most writers among subtle literary theories, and whose remains are still full of curious interest for the student of literature as a fine art.
The author of the English Humourists of the Eighteenth Century, coming to the humourists of the nineteenth, would have found, as is true preeminently of Thackeray himself, the springs of pity in them deepened by the deeper subjectivity, the intenser and closer living with itself, which is characteristic of the temper of the later generation; and therewith, the mirth also, from the amalgam of which with pity humour proceeds, has become, in Charles Dickens, for example, freer and more boisterous.
To this more high-pitched feeling, since predominant in our literature, the writings of Charles Lamb, whose life occupies the last quarter of the eighteenth century and the first quarter of the nineteenth, are a transition; and such union of grave, of terrible even, with gay, we may note in the circumstances of his life, as reflected thence into his work. We catch the aroma of a singular, homely sweetness about his first years, spent on Thames' side, amid the red  bricks and terraced gardens, with their rich historical memories of old-fashioned legal London. Just above the poorer class, deprived, as he says, of the "sweet food of academic institution," he is fortunate enough to be reared in the classical languages at an ancient school, where he becomes the companion of Coleridge, as at a later period he was his enthusiastic disciple. So far, the years go by with less than the usual share of boyish difficulties; protected, one fancies, seeing what he was afterwards, by some attraction of temper in the quaint child, small and delicate, with a certain Jewish expression in his clear, brown complexion, eyes not precisely of the same colour, and a slow walk adding to the staidness of his figure; and whose infirmity of speech, increased by agitation, is partly engaging.
And the cheerfulness of all this, of the mere aspect of Lamb's quiet subsequent life also, might make the more superficial reader think of him as in himself something slight, and of his mirth as cheaply bought. Yet we know that beneath this blithe surface there was something of the fateful domestic horror, of the beautiful heroism and devotedness too, of old Greek tragedy. His sister Mary, ten years his senior, in a sudden paroxysm of madness, caused the death of her mother, and was brought to trial for what an overstrained justice might have construed as the greatest of crimes. She was  released on the brother's pledging himself to watch over her; and to this sister, from the age of twenty-one, Charles Lamb sacrificed himself, "seeking thenceforth," says his earliest biographer, "no connexion which could interfere with her supremacy in his affections, or impair his ability to sustain and comfort her." The "feverish, romantic tie of love," he cast away in exchange for the "charities of home." Only, from time to time, the madness returned, affecting him too, once; and we see the brother and sister voluntarily yielding to restraint. In estimating the humour of Elia, we must no more forget the strong undercurrent of this great misfortune and pity, than one could forget it in his actual story. So he becomes the best critic, almost the discoverer, of Webster, a dramatist of genius so sombre, so heavily coloured, so macabre. Rosamund Grey, written in his twenty-third year, a story with something bitter and exaggerated, an almost insane fixedness of gloom perceptible in it, strikes clearly this note in his work.
For himself, and from his own point of view, the exercise of his gift, of his literary art, came to gild or sweeten a life of monotonous labour, and seemed, as far as regarded others, no very important thing; availing to give them a little pleasure, and inform them a little, chiefly in a retrospective manner, but in no way concerned with the turning of the tides of the great world. And yet this very modesty, this unambitious  way of conceiving his work, has impressed upon it a certain exceptional enduringness. For of the remarkable English writers contemporary with Lamb, many were greatly preoccupied with ideas of practice—religious, moral, political—ideas which have since, in some sense or other, entered permanently into the general consciousness; and, these having no longer any stimulus for a generation provided with a different stock of ideas, the writings of those who spent so much of themselves in their propagation have lost, with posterity, something of what they gained by them in immediate influence. Coleridge, Wordsworth, Shelley even—sharing so largely in the unrest of their own age, and made personally more interesting thereby, yet, of their actual work, surrender more to the mere course of time than some of those who may have seemed to exercise themselves hardly at all in great matters, to have been little serious, or a little indifferent, regarding them.
Of this number of the disinterested servants of literature, smaller in England than in France, Charles Lamb is one. In the making of prose he realises the principle of art for its own sake, as completely as Keats in the making of verse. And, working ever close to the concrete, to the details, great or small, of actual things, books, persons, and with no part of them blurred to his vision by the intervention of mere abstract theories, he has reached an enduring moral effect  also, in a sort of boundless sympathy. Unoccupied, as he might seem, with great matters, he is in immediate contact with what is real, especially in its caressing littleness, that littleness in which there is much of the whole woeful heart of things, and meets it more than half-way with a perfect understanding of it. What sudden, unexpected touches of pathos in him!—bearing witness how the sorrow of humanity, the Weltschmerz, the constant aching of its wounds, is ever present with him: but what a gift also for the enjoyment of life in its subtleties, of enjoyment actually refined by the need of some thoughtful economies and making the most of things! Little arts of happiness he is ready to teach to others. The quaint remarks of children which another would scarcely have heard, he preserves—little flies in the priceless amber of his Attic wit—and has his "Praise of chimney-sweepers" (as William Blake has written, with so much natural pathos, the Chimney-sweeper's Song) valuing carefully their white teeth, and fine enjoyment of white sheets in stolen sleep at Arundel Castle, as he tells the story, anticipating something of the mood of our deep humourists of the last generation. His simple mother-pity for those who suffer by accident, or unkindness of nature, blindness for instance, or fateful disease of mind like his sister's, has something primitive in its largeness; and on behalf of ill-used animals he is early in composing a Pity's Gift.
And if, in deeper or more superficial sense, the dead do care at all for their name and fame, then how must the souls of Shakespeare and Webster have been stirred, after so long converse with things that stopped their ears, whether above or below the soil, at his exquisite appreciations of them; the souls of Titian and of Hogarth too; for, what has not been observed so generally as the excellence of his literary criticism, Charles Lamb is a fine critic of painting also. It was as loyal, self-forgetful work for others, for Shakespeare's self first, for instance, and then for Shakespeare's readers, that that too was done: he has the true scholar's way of forgetting himself in his subject. For though "defrauded," as we saw, in his young years, "of the sweet food of academic institution," he is yet essentially a scholar, and all his work mainly retrospective, as I said; his own sorrows, affections, perceptions, being alone real to him of the present. "I cannot make these present times," he says once, "present to me."