The difference between good and great is the extra effort.
优秀和卓越的区别在于额外的努力。
The past is never dead. It's not even past.
过去并没有死去;它甚至还没有过去。
理论不应该试图解释所有事实,因为有些事实是错误的。
Don't get involved in partial problems, but always take flight to where there is a free view over the whole single great problem, even if this view is still not a clear one.