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.