You will inevitably become who you believe yourself to be.

你不可避免地成为你想成为的人。

If you spend enough time saying, "I'm not smart enough, thin enough and rich enough," it's likely that you will someday be right.

 

On the contrary, if you have the belief that you are smart enough, thin enough and rich enough now to take the next positive stepforward, over time you will likely acquire the capacity to be these very things at your desired level of expectation.