Fred Smith: I think that most of the time, the biggest risk that entrepreneurs have to face is internal risk. They must decide that this is something they want to spend their whole lives doing, not something else, because many new ideas will really meet with great resistance. Resistance sometimes comes from the market, sometimes from capital, and sometimes from the enemy. But it takes fanatical work to turn a well-thought-out idea into a successful reality step by step. Many people succeed at first, but they can't stick to it. Therefore, I think that if a person wants to become an entrepreneur, he must first overcome this difficulty. Entrepreneurs must reflect on their own souls: "Do I make this idea successful day after day and month after month?" Not everyone can do this.