If you're not improving, you're falling behind—especially in an industry as dynamic as animal husbandry.
The young do not know enough to be prudent, and therefore they attempt the impossible – and achieve it, generation after generation.
读书学习的人要像闺中少女一样小心谨慎对待别人。做官之后如同过了门的媳妇,要使百姓能各有所养。年老辞官后如同慈祥的老太婆,要担负起教育后人的责任。