The best way to adapt oneself to societyand to get rich knowledge is reading. No entertainment is cheaper than reading, and no pleasure lasts longer than reading. Reading can enrich people’ s life, enable people keep pace with time and pure people’ s heart. 

First of all, reading makes people’ s life more colorful. He, who reads, is not constrained by his own experience. Through a book, they can transcend time and space and focus on the unknown. According to a renowned ancient Chinese philosopher Xunzi, you will never be unaware of the height of the sky until you climb a high mountain. There are many unknown areas in our life, and reading acts as a master key which opens doors for us to see a bigger and better world. Reading books gives us strength to overcome difficulties. Reading makes life more meaningful and makes life more exciting. The book is a good teacher, it lights the way of life. There is no constant teacher for sages, if any, it must be the book. 

In addition, reading helps people keep up with the times. The book, which records history, reflects the present and predicts the future. Over the past 50 years, human society has created more knowledge than the past 3, 000 years combined. In the agrarian age, one can live on his knowledge from several years’ learning. But now, an age of knowledge economy, one must keep learning throughout all his life to keep up with the times. 

Moreover, reading is a process of stripping away obstacles in the mind and pure our heart. An elegant mind derives from books. Elegant behaviors are only superficial, instead, an elegant soul is more precious and rare. People who read a lot are open-minded and have a special taste of life. As an old saying goes, one who is filled with knowledge always behaves with elegance. Nowadays, most of us are absorbed in entertainments, thus the whole society is full of fickle ambience. Through reading, we can slow down and ask ourselves these questions in silence: Who Am I? What does my heart desire? Your heart will tell you to keep a lily-white heart from being tainted by the society. 

In a word, reading makes our life more colorful. It gives us inspiration of the latest thoughts and things. And the most important thing is that it helps us keep pure in an age of extravagance and waste. 

这首诗出自朱熹的《观书有感》，是因“观书”而发的感悟。特别是“问渠那得清如许，为有源头活水来”两句，借水之清澈是因为有源头活水不断注入，暗喻人要心灵澄明，就得认真读书，时时补充新知识。

范文从三个角度谈论了读书的重要性：读书可以丰富人们的知识；读书可以让我们与时俱进；读书使我们在浮躁的物质社会保持内心纯净。第一段首先提出了这三个重要性，后面三段对这三点进行了解释，最后一段进行了总结。