Keep in mind that you are used to old habits, old thoughts, old ways of thinking. You're used to walking past that invisible-to-you door. That "small ball of heretofore-unknown peace and relief" is the knowledge that you can do this, but your ego is fighting you tooth and nail, telling you that you need to stick to the old "trusted" habits. It's trying to continue the old habit of hiding the door from you.

The difference is that you now know those old habits are not to be trusted. Don't let that door be hidden from you any longer. The more you look, and the more you drag out and deal with whatever's inside, the bigger that ball of peace will become.