效率是把事情做对；效能是做对的事情。

The true measure of success is leaving the land better than we found it.

Love is the most important thing in the world, but music is pretty close.

If you lose or forget to bring a cable，adapter or charger，check with your hotel. Most hotels now have a drawer full of cables，adapters and chargers others have left behind，and probably have the one you are missing. You can often claim it after borrowing it.

I have now taken a serious task upon myself and I fear a greater one than is in the power of any man to perform.

数学是理性的音乐。