In order to have continuous quilting with no breaks at the end/start point, finish the first thread by burying the knot one stitch length from the point where it exits the quilt top. With the new thread, bury the knot about half an inch from the end point of the last stitch coming up in the exact hole the last stitch went into the quilt. Now begin quilting again by inserting the needle back through this same hole, going all the way though the quilt.