This is not mysticism. It is neuroscience and it is practical.
The reality you experience is not the world as it is. It is the world as your perceptual system constructs it — filtered through your attention, your prior beliefs, your emotional state and your working model of how things operate. Two people in the same room are not in the same room. They are in two different rooms constructed by two different perceptual systems from the same raw material.
This has a practical implication that most people miss: if you can change your perception, you change your experience of reality — and therefore the actions you take within it. The person who walks into a negotiation believing they will close it operates differently than the person who believes they probably will not. That operational difference produces different behaviour, which produces different outcomes. The perception precedes the reality.
I have used this deliberately in the hardest periods of my life. In the hardest period of my life, I deliberately constructed a perception of the future that was more capable and better-resourced than my current situation. Not as self-deception — I was clear-eyed about the current situation. But as a navigation tool. I need to be able to see where I am going in order to move toward it.
The profound insight is that what you perceive determines what you pursue. And you have more agency over your perception than most people exercise. You can choose what to focus on, what frame to apply, what story to tell yourself about what is happening. Exercise that agency deliberately. Construct a perception that enables the actions you need to take.