Something that seems to entertain my children, when it comes up in conversation, is how many years I can get out of a pair of shoes. In fact, I have a pair of sneakers that I like to wear that still look reasonably new, even though I bought them several years ago.
But that wasn't the case when I was a kid. As a child, I would go through sneakers rather quickly. I was always outside doing something and I played several sports that involved a high degree of running, so if a pair of sneakers lasted me a few months, that was considered good.
Being one of three siblings, the rate at which I would burn through a pair of shoes during that season wasn't a minor expense for my parents. That being the case, on occasion, we would opt for buying some knock off brands from time to time. Unfortunately, even though it initially felt like we were saving money, those shoes didn't hold up very long. They were cheap substitutes and I can still remember the way they would crack and tear after very little use.
There are some areas where it doesn't pay to settle for a cheap substitute, the most obvious being in our spiritual lives. There is no substitute for a relationship with the true and living God. No idol or humanly invented deity can comfort the heart and give lasting hope to the soul. That's something the Lord makes clear to Jeremiah in this passage of Scripture.