The Bible tells us that if we carry around our old stuff too long, it will become an idol and it will be nothing but a burden. Isaiah tells Judah that, attracted as they were to the false gods of Canaan, they are going to wear themselves out carrying around burdensome stuff they should have gotten rid of a long time ago.  The prophet insisted that that was a luxury they could ill afford, and that, in fact, they were showing the symptoms of a disease called nostalgia.