Material possessions aren't wrong or worthless, they are just ineffectual at producing lasting satisfaction. They have a steep curve of diminishing returns, and they tend to distract from more worthwhile pursuits. As stated in this quote, someone who only has shallow material possessions to live for will constantly be on the brink of despair. If they were to lose that crutch, it may be that they would be forced to find something else to give their life meaning.