科学没有捷径，只有脚踏实地。
Le bonheur n'est pas chose aisée. Il est très difficile de le trouver en nous, impossible de le trouver ailleurs.
We don't have anything to lose, which is a very liberating feeling.
We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.
成功不是终点，失败也并非致命，重要的是继续前进的勇气。
The stock market is filled with individuals who know the price of everything, but the value of nothing.
We must mine coal responsibly today so that our children inherit both energy security and a healthy environment.