你唯一的限制是你给自己设定的那些。

解释：只是一种声音就没有听头，只是一种颜色就没有文采，只是一种味道就不成其为美味，只是一种事物就无法进行衡量比较。

The ideas of economists and political philosophers， both when they are right and when they are wrong， are more powerful than is commonly understood. Indeed the world is ruled by little else. Practical men， who believe themselves to be quite exempt from any intellectual influence， are usually the slaves of some defunct economist.