Lost wealth may be replaced by industry, lost knowledge by study, lost health by temperance of medicine, but lost time is gone for ever.

• 失去的财富可以靠勤奋换来,失去知识可以靠学习得来,失去的健康可以靠节制中药物得来,但是失去的光阴一去不复返。英国作家斯迈尔斯。