成功不是终点，失败也非末日，重要的是继续前进的勇气。
人们算计太多，思考太少。
估计问题的性质与检验统计假设的问题不同。
你的过去无法过去是因为我。
I used to think the world was broken down by tribes. Then I thought it was broken down by rich and poor. Then I thought it was broken down by stupid and smart. But I know now that it is broken down by people who are alive and people who are dead.
The ocean doesn’t belong to us; we belong to the ocean. Our responsibility is to nurture it.
Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.