乐天悲脱发,退之叹堕齿;吾年垂九十,此事已晚矣。发脱妨危冠,齿堕废大嚼,晨兴对清镜,何以慰寂寞?造物本无心,岂欲使汝衰。曷不望长空,两曜无停时!