Your mind is not just your brain but your soul and spiritual energy.
Matter is another name for stuff - physical objects or material.
If you put mind over matter then you can overcome seemingly impossible problems; perhaps you could walk on hot coals without feeling pain or for that matter, bend a spoon.
You see, when I was a kid, the playground was full of children trying to to bend spoons stolen from the school canteen.
Why? A charismatic young man called Uri Geller had arrived on British TV screens and was sweeping the country with his paranormal show. Did he really have psychic and telekenetic powers or was he just a clever trickster?
See for yourself and decide if it's a matter of mind over matter!