Well, that is certainly an intriguing quote...

Regarding belief and accomplishment...there are generally several things required in order to do something difficult.

1. Have the intention to do it.
2. Learn the technique through practice and discipline over a period of time. You start with easier stuff, move toward harder stuff.
3. Be in good enough health so that you have enough strength and energy available to do it.
4. Focus the mind properly on the task.
5. Believe...no, don't just believe, but KNOW you can do it.

Just belief alone is not enough. That's why it takes years of training and hard work to be a good martial artist, and why very few people can break a cement block with their bare hands. A few people can do it. They didn't get there just by believing they could, but belief is a important part of it.

It isn't a technique I have any facility in, because I have never practiced such a technique or aspired toward it.