Items not used - clothing still with tags, gifts given and never opened, junk mail, stacks of paper on desks, unused kitchen gadget, tchotchkes, gewgaws, knickknacks, and trinkets - all add to our mental clutter . Not only do they weigh us down, they drain our energy by overwhelming us with feelings of shame and dread. We are beloved Children of God made to love. Why love things that can't love us back?
Here's a thought -- Donald Winnicott theorized that we need transitional objects to move from one phase to another. Most of the time it's a kid's lovey: a teddy bear, a blanket. Do adults need these transitional objects as well to move from one point in their lives to another? Is that one of the reasons we clutter up our lives?
Also from Winnicott -- according to Wikipedia -- "When the person has to comply with external rules, such as being polite or following social codes, then a False self is used. The False self is a mask of the false persona that constantly seeks to anticipate demands of others in order to maintain the relationship." Do we use our 'stuff' and excess of possessions to create that false self? What would happen if we stripped away all that was unnecessary in our lives? Could we then be our true self that God intended us to be?