18、knowledge is the best food for the elderly。 -- Aristotle
19、the study of literature, is not good。 The former literary youth, often dislike mathematics, science, history, biology, think these are nothing, then become even common sense。 -- Lu Xun
20、Not afraid of reading less, I remember。 -- Xu Teli
21、Read more and unthinking, you think you know a lot, and when you're reading and thinking, the more, the more you will clearly see, you know, little。 -- Voltaire
22、The two things of human knowledge and human power is combined; the failure of work are in ignorance of causality。 -- Bacon