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。
I like pressure. I think pressure is a privilege.
Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.
——1963年6月25日在西德市政厅柏林墙前的演说
我学得越多，就越意识到自己不懂的还有很多。