It is a very dangerous thing for a literary man to indulge his love for the ridiculous.
 Oliver Wendell Holmes Sr., The Autocrat of the Breakfast-Table (1858). copy citation

Context

“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; But you may see it every day in children; and if you want to choke with stifled tears at sight of the transition, as it shows itself in older years, go and see Mr. Blake play Jesse Rural. It is a very dangerous thing for a literary man to indulge his love for the ridiculous. People laugh with him just so long as he amuses them; but if he attempts to be serious, they must still have their laugh, and so they laugh at him. There is in addition, however, a deeper reason for this than would at first appear.” source