A paradox exits in the acting process that lives in a Dialetic:
What you are in, the story, is not real.
What you must do to make this story impactful is to be real (authentic).
The bridge across the paradox is the imagination, which resides not in conscious effort, but in the subconscious.
The subconscious - the deep wellspring of our true creativity.
All the conscious elements of the craft, from text to stage to scene partner, to director, to costume, to lights, to scenery, to audience must become servants to your imagination, which emerges when the subconscious is free to interpret and respond to the world you present it.
That means self-consciousness is the first thing that must be eradicated from your work.
Indicated states of being and action
Showing instead of Doing
Attention to yourself and what you are doing vs. attention to the other person.
All of these barriers, and the myriad others that come along with them, are aspects of the conscious mind "performing" a role.
Breask down these barriers in order to allow your true creativity to inform your work.
To me, that is at the core of Stanislavsky's "Magic If".