Great writers tend to include one of the following: belief your work is important, a simple curiosity, playfulness w/the process...

Based on the following:

Susan Perry’s Writing in Flow: Keys to Enhanced Creativity 

According to Perry, for great writers, the right reasons, while idiosyncratic, tend to include at least one of the following:

• A belief that your work is worthwhile and important
• A curiosity, bordering on excitement, for your story or poem.
• A sense of play about the process of writing