Many threads can be clipped away when lines of quilting start and stop at the edges of the quilt and will be covered by the binding. When they start and stop in the middle of the quilt like to bring the bobbin thread up and hold it to begin the stitching. I later tie and bury that thread. When I stop one of these lines of stitching I pull the work out of the machine fare enough to create a tail of six inches or so and clip front and back. I pull that thread to the back of the quilt, tie and then bury on the back. I try to tie and bury as I go.