if the sense of the ridiculous is one side of an impressible nature, it is very well; but if that is all there is in a man, he had better have been an ape at once, and so have stood at the head of his profession. Laughter and tears are meant to turn the wheels of the same machinery of sensibility; one is wind-power, and the other water-power
 Oliver Wendell Holmes Sr., The Autocrat of the Breakfast-Table (1858). copy citation

Context

“,—on the strength of some youthful antic of his, which, no doubt, authorizes the intelligent constituency of autograph-hunters to address him as a harlequin? —Well, I can’t be savage with you for wanting to laugh, and I like to make you laugh, well enough, when I can. But then observe this: if the sense of the ridiculous is one side of an impressible nature, it is very well; but if that is all there is in a man, he had better have been an ape at once, and so have stood at the head of his profession. Laughter and tears are meant to turn the wheels of the same machinery of sensibility; one is wind-power, and the other water-power; that is all. I have often heard the Professor talk about hysterics as being Nature’s cleverest illustration of the reciprocal convertibility of the two states of which these acts are the manifestations;” source