R. M. Ballantyne 
Story of the Rock 

(Excerpt): "Mrs Potter was a woman of large body and small brain. In respect of reasoning power, she was little better than the wooden cuckoo which came out periodically from the interior of the clock that stood over her own fireplace and announced the hours. She entertained settled convictions on a few subjects, in regard to which she resembled a musical box. If you set her going on any of these, she would harp away until she had played the tune out, and then begin over again; but she never varied. Reasons, however good, or facts, however weighty, were utterly powerless to penetrate her skull: her "settled convictions" were not to be unsettled by any such means. Men might change their minds; philosophers might see fit to alter their opinions; weaklings of both sexes and all ages might trim their sails in accordance with the gales of advancing knowledge, but Mrs Potter-no: never! her colours were nailed to the mast. Like most people who unite a strong will with an empty head, she was "wiser in her own conceit than eleven men that can render a reason:" in brief, she was obstinate."