"El pasado es un país extranjero; allí hacen las cosas de otra manera."

"No one can build you the bridge on which you, and only you, must cross the river of life."

The best way to find out if you can trust somebody is to trust them.

When crisis comes, true leaders must dare to take responsibility and make quick decisions.

P与NP问题是计算机科学中最重要的一个问题之一。