Boundary

I can’t!” Maggie was now standing on the wall. “Past the boundary wall is a bad place. I’m not allowed in the bad place.

Sian B. Claven

Dare to dream and yearn to learn to cross the boundary of fears and doubts.

Debasish Mridha

Enjoyment appears at the boundary between boredom and anxiety, when the challenges are just balanced with the person's capacity to act.

Mihaly Csikszentmihalyi