Have you ever heard of the story 'Borrowing Light through a Hole in the Wall'?
In the Western Han Dynasty,there was a man called Kuang Heng.When he was young,he worked very hard, but there was no candles for light in his home. His neighbor had the candles, but the light could not reach his house.Eventually, a hole was dug into the wall through which the light of his neighbor could come in,by the night,he read and read.
There was a rich man,called ChengBushi in the village nearby,who had a great many books. Kuangheng went and offered to work for him without pay.The landlord was curious and asked why he did so, he said: "I hope I can get your books, and read all of them." Being touched , the landlord agreed and lent him his books. So Kuangheng became a great scholar later.