如果你确信自己走在正确的道路上，并且内心深知这一点，那么无论别人说什么，都无法让你动摇。
经济史告诉我们，改变是可能的，但很少是容易的。
The power of abstraction is that it allows us to ignore details that are not relevant to the task at hand.
In one minute you can change your attitude and in that minute you can change your entire day.
The only existence we conceive is the existence of sensible things.