The most important challenge facing the world today is the need to create strong, effective, and accountable states in the developing world.

We are all afraid—for our confidence, for the future, for the world.

在好处中要取大的，在害处中要取小的。在生活中会遇到好处，也会遇到坏处。对待好处，无疑应择其大者而取之，以获取最佳利益；对坏处，能避免则避免，不能避免则择其小者而取之，以最大限度地减少损失。

I have always believed that if you want to achieve anything in life, you have to work for it.

Black holes are not just cosmic vacuums; they are the ultimate laboratories for testing the limits of our physical theories.