"Quantum cryptography is not about keeping secrets, it's about knowing when someone is trying to steal them."

The only limit to our realization of tomorrow will be our doubts of today.

The American farmer is the only man in our economy who has to buy everything he buys at retail, sell everything he sells at wholesale, and pay the freight both ways.

国家安全是最高法则。

"The truth is that literature is the only way to overcome death."

当你阻止某人胡言乱语的时候，你就无法证明他是个骗子。你只是向其他人表示你害怕他说出什么。