The most necessary, the most important, the principal, the most essential thing for a musician is this: to know what he wants, what he can do, and what he ought to do.

解释：辅与车互相依存，嘴唇没有了，牙齿就要受寒。

过去总是紧张的，未来是完美的。

There is no failure except in no longer trying.

The trend is your friend until it ends.

实现不可能的唯一途径是相信它是可能的。