年轻时学到的东西能制止年老之恶；
如果你之道老年以智慧为食，年轻时便会励已勤学，
以免老年时缺少养分。
Learning acquired in youth arrests the evil of old age i and if you understand that old age has wisdom for its foods,you will so conduct yourself in youth that your old age will not lack for nourishment.

达文西

以上资料来自台湾作家王乾任的《你也可以成为达文西》