In this world, competition will never stop, so we have no time to rest. What we can do is to take iron determination to meet the challenges and competitions that come one after another, and be cheerful and enjoy it. 38 letters Rockefeller left his son.

In this world, the competition will not stop for a second, and we have no time to rest. What we can do is to face one challenge and competition after another, keep a positive attitude with iron determination and enjoy it.