on Live Write Thrive:

Fiction writers (and readers!) love conflict. Conflict is story. Conflict keeps readers on the edge of their seats, turning pages, hoping that all the turmoil will resolve in a satisfying way (but not until the last page).
While much attention is given to outer conflict, inner conflict is a more potent force that breathes life into characters and imbues scenes with depth and resonance. Writers who master the skill to intricately weave inner conflict into their stories craft characters that leap off the page and resonate on a profound level.