"With a bang and a boom!"
I never want to actually quit anything I've started on. I just take breaks from my projects because I can't work on the same thing for months on end (that goes for every hobby I got). To some, I returned to in time, while some other projects I never got back to again because I felt I didn't have enough ideas to keep going, or because I felt my time was better spent working on something new/different instead, or some other reason. Even if I quit a project, I tend to take stuff from those abandoned projects and insert them in newer projects if I can find a place for it, so my work doesn't just go to waste.