自由不仅仅是随心所欲的机会；也不仅仅是在既定选项之间选择的机会。自由首先是制定可用选择的机会，对它们进行辩论——然后，是选择的机会。
Freedom is not merely the opportunity to do as one pleases; neither is it merely the opportunity to choose between set alternatives. Freedom is, first of all, the chance to formulate the available choices, to argue over them - and then, the opportunity to choose.
The future of energy lies in diversification—no single source will meet all our needs.
真正的领导者倾听多于发言，学习多于教导。
The only limit to our realization of tomorrow will be our doubts of today.
We are just beginning to understand the potential of genome editing—and the questions it raises.
一个人格就是一场完整的演说家和压力集团的国会，里面有孩子、煽动者、共产主义者、孤立主义者、战争贩子、骑墙派、贪污者、祈祷会、通灵者和占星家。
Leadership is solving problems. The day soldiers stop bringing you their problems is the day you have stopped leading them.