You can't knock on opportunity's door and not be ready.

成功的投资是建立在对基本面的深入了解和长期投资的基础上。

释义：在富贵时，朋友无数；一旦遭遇困难，却无人帮助。

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.