我们无法不了解历史。

If you are not willing to learn, no one can help you. If you are determined to learn, no one can stop you.

He who refuses to do arithmetic is doomed to talk nonsense.

如果每一天都过得很充实而富有意义，世间的岁月和时间，算起来还是蛮长的呢，然而终日埋头苦干，匆匆忙忙走过的人，哪里有功夫停下来思考这些道理；天地很开阔，世界很大，而人们往往局限于自己的视野和格局，只停留在很狭小的范围里；风花雪月原本无意，而附庸风雅的人却在那里自寻烦恼。