Innovation comes from saying no to a thousand things to focus on the few that really matter.

Circumstances rule men; men do not rule circumstances.

Sustainability isn't a choice; it's our responsibility to the next generation.

International politics is a ruthless and dangerous business, and it is foolish to expect states to behave according to moral principles.

对效率的追求常常会背道而驰。不要总想着寻找可以快速完成任务的方法，而应该以找到你不想停下来的任务为目标。