Free vaccines are more valuable than expensive treatments, yet harder to promote.
免费的疫苗比昂贵的治疗更有价值，但更难推广。
当语言变得苍白无力，音乐就开始诉说。
The splinter in your eye is the best magnifying-glass.
写作的艺术是发现一个人所相信的东西的艺术。