But the deep background that lies behind and beyond what we call humour is revealed only to the few who, by instinct or by effort, have given thought to it. The world's humour, in its best and greatest sense, is perhaps the highest product of our civilisation. One thinks here not of the mere spasmodic effects of the comic artist or the blackface expert of the vaudeville show, but of the really great humour which, once or twice in a generation at best, illuminates and elevates our literature. It is no longer dependent upon the mere trick and quibble of words, or the odd and meaningless incongruities in things that strike us as "funny." Its basis lies in the deeper contrasts offered by life itself: the strange incongruity between our aspiration and our achievement, the eager and fretful anxieties of to-day that fade into nothingness to-morrow, the burning pain and the sharp sorrow that are softened in the gentle retrospect of time, till as we look back upon the course that has been traversed we pass in view the panorama of our lives, as people in old age may recall, with mingled tears and smiles, the angry quarrels of their childhood. And here, in its larger aspect, humour is blended with pathos till the two are one, and represent, as they have in every age, the mingled heritage of tears and laughter that is our lot on earth.