16. The reading of all good books is like a conversation with the finest men of past centuries.
    阅读好书, 就好比是同过去多少世纪最杰出的人们交谈。
                                       -----R. Descartes 笛卡尔
17. Laziness in youth spells regret in old age.
    少壮不努力, 老大徒伤悲。
18. Knowledge makes humble, ignorance makes proud.
    知识使人谦虚， 无知使人骄傲。
19. If you run after two hares, you will catch neither.
    同时追二兔， 全都抓不住。
20. One must draw back in order to leap better.
退后才能跳得更远。