If you don’t believe this, or understand it, think about how the opposite applies. It’s very difficult to act like a failure and succeed.
Think about it. Try acting like you aren’t dieting and try to lose weight. Try acting like you are weak and get stronger. Try acting lazy at work and see if you get a promotion. How you act determines how successful you can become.
If you want to get stronger, do things that require strength. If you want to get healthy, act like it. If you want to get a promotion, show your employer you deserve it.
You will never get maximum results doing the bare minimum. If you are taking shortcuts, the only one you are ultimately shorting is yourself.