Seneca, while referring to the role that things play in our lives, had this to say:

…mortals, most wretched in this respect also, are deceived: for we think that we hold them in our grasp but they hold us in theirs.

Remember that stuff is just stuff. Our things are not what we are composed of, not what define us, and they are not what we ought to set our aims towards. The acquisition of quality or luxury goods is an unintended consequence of your actions. He also provided the following metaphor:

He is a great man who uses earthenware dishes as if they were silver; but he is equally great who uses silver as if it were earthenware.

The active pursuit of luxury is as bad as the self-imposed rejection of anything not common.