《颜氏家训·勉学篇》
但人会有困顿不得志而壮年失学，更应该在晚年抓紧时间学习，不可以自己放弃。
然人有坎禀，失于盛年，犹当晚学，不可自弃。
But in life there are hardships and misfortune and studies in middle-age are neglected, all the more so in old age one should seize the time to study, one cannot give up.