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You can achieve difficult things, but you can't achieve the impossible.

You can do what you have to do, and sometimes you can do it even better than you think you can.

I can only do what I can do.

You cannot do only one thing.

What we can or cannot do, what we consider possible or impossible, is rarely a function of our true capability. It is more likely a function of our beliefs about who we are.

If you think you can do it, you can.

You can't try to do things; you simply must do them.