It is the basic tenet of Lichtenbergianism that you're always better off (almost) to put off working on or especially finishing that sonnet or novel or computer program.

For this to work in your favor, however, you must practice what is known as structured procrastination, and that means simply that at any given time you are avoiding one project by working on another.  You may not be working on the novel, but that's because you've been building a labyrinth in your back yard.

Another facet to procrastination is that very often your creative projects need time to simmer—if you put off starting a project or continuing work on it, you may find that ideas on what to include or on how to change it may begin to clamor for your attention.