There is a quote from Calvin Coolidge above my computer:

 

‘Nothing in the world can take the place of Persistence.

Talent will not; nothing is more common than unsuccessful men with talent.

Genius will not; unrewarded genius is almost a proverb.

Education will not; the world is full of educated derelicts.

Persistence and determination alone are omnipotent.

The slogan ‘Press On’ has solved, and always will solve the problems of the human race.’

 

This is also the case in writing, with a caveat.  Writing requires personal determination and persistence to finish a story once begun, because there always will be rough spots in developing the story, dissatisfaction of the editor with the presentation, and numerous edits to fix errors in spelling, language, and word usage.  The problem with ‘Press On’ is that there are times where starting over on the idea of a story works better than attempting yet another re-write.  There’s no way to figure out where the line is, except your own opinion.  You have to honestly look at your work and decide where the line is between re-editing, and starting over.  Only you can make that final decision, as you’re the one with the vision and the story.