There are two things that don't have to mean anything, one is music and the other is laughter.
有两样东西不一定要有意义，一个是音乐，另一个是笑。
自然的统一性不是一个事实，而是一项任务。
Hope is what enables us to keep going in the face of adversity.
The best teacher is the one who suggests rather than dogmatizes, and inspires his listener with the wish to teach himself.
