Randy Alcorn has a great quote about this topic, "Every increased possession adds increased anxiety on to our lives."
Possessions do add stress to our lives—because they need to be cleaned, organized, and cared for. Everything we own becomes our responsibility to deal with and take care of. Possessions are not passive, they are not just acquired, stored, and forgotten while they care for themselves. They require our attention. Everything we own takes up physical space in our home and mental space in our mind.
Which brings us to this less recognized truth, "Owning less means living more."