Take long walks in stormy weather or through deep snows in the fields and woods, if you would keep your spirits up. Deal with brute nature. Be cold and hungry and weary.

Do just once what others say you can't do, and you will never pay attention to their limitations again.

正是依靠观察和思考才能找到方法。所以我们必须不断挖掘和钻研。

市场是经济周期的反映。