One should not have unfinished business. One should not waste, or leave a mess in their wake. One should complete all their works.
Examples of finishedness:
"Don't bite off more than you can chew." Resources are limited, time most of all. Get more out of what you have by minimizing loss. Sometimes scraps are unavoidable and unusable, but don't get comfortable with waste. Save and resuse what you can. Make good use of your time.
Put things in their place. Tie up loose ends; literal and metaphoric. If you make a mess, clean it up. Life is easier for us and everyone around us if we minimize chaos.