When you decide to stop thinking negatively, and do not have an immediate, new positive vocabulary to replace the old, you will always return to the comfortable, old negative self-talk of the past. If you got rid of your old furniture and stored it in the garage, and you had no new furniture to replace it with, if I were to visit you again in three weeks, you would have all of your old furniture back in your apartment. You would probably have rearranged it, to make it look different, but would be the same old furniture, the same old programming you had in the first place.