For me this was learning how subjective the human experience is from studying hypnosis.
Most of our physical experiences are defined by the stories we tell ourselves.
If someone tells you your feet are stuck to the floor and you subconsciously believe it, it is so.
A lifetime of chronic pain can vanish in an instant when your brain believes a different story, by for example a hypnotist telling you so.

This also portrays to our self-esteem and what we can accomplish in the world. 
We put so many limitations on ourselves.
You don't know what you can't do. 

 Have you come across the book, the 4 agreements?

It's very much aligned with what you're saying but it focuses on the agreements we make as we interact with others.

When you agree with the perspectives or words presented by another, you make an agreement. This agreement is then bundled with the other agreements you've made & affects your experience in this realm.

The book presents a way to start breaking previously made agreements & accepting 4 new agreements to help live a more fulfilling life.

https://v.nostr.build/O5JP.mp4