你说的话有什么益处呢？如果没有益处还要说，就是白费口舌。 

The best time to plant a tree was 20 years ago. The second best time is now.

You cannot hope to build a better world without improving the individuals. To that end, each of us must work for our own improvement and, at the same time, share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.

文字的力量可以改变世界。