Never stop learning, because the world never stops changing.
永远不要停止学习，因为世界从未停止变化。
The novel is the art of making the invisible visible.
The writer must believe that what he is doing is the most important thing in the world. And he must hold to this illusion even when he knows it is not true.
Your most unhappy customers are your greatest source of learning.
If you borrow something， try to return it in better shape than you received it. Clean it， sharpen it， fill it up.