我们不是从祖先那里继承了地球；我们是从子孙那里借来的。
We don't inherit the earth from our ancestors; we borrow it from our children.
The greatest obstacle to progress is not ignorance, but the illusion of knowledge.
Space is a way of existing in relation.
没有优秀的人才，你就无法成为伟大的领导者。