ultimately we should be able to do everything with our minds only

Yes yes yes! This is such an important realisation.

I can think of so many examples in which I built machines or systems to get a particular job done only to find that once I understood the process I didn't need the machine any more.

Just a few months ago I made a pot of plants grow faster/stronger than a control group with my mind, sending love to the pot for five mins a day. This was after creating machines which did the job (electroculture spirals & pyramids). Same story with the cloudbuster (Don Croft model) I started to build earlier this summer. Once I understood how the machine worked we started to get regular rain! And I never finished building it. That being said, we could do with a bit more after this last week and I may just build it now. Very uncomfortable temperatures. 32°C at midnight last night! One final example which jumps to mind is my hair. Three years ago I set about understanding why men lose their hair because I didn't want to lose mine. I developed a bunch of systems and made it grow back. But since then I have done nothing and yet the hair continues to grow. This baffled me until I did the pot of plants mind-growth experiment. Now I understand. It can all be done with the mind. No matter what it is.

So it's like the knowledge of HOW holds some kind of power. This combined with strong intentions I would say.