This sounds shitty if you phrase it like that, but there is some profound truth behind that. Your financial health depends almost more than anything else on your ability to spend less than is available to you. Ideally, you will achieve that without hurting your quality of life by optimizing your expenses, and by mentally overcoming that widespread modern delusion that quality of life is measured in money spent.

But sometimes that isn't really possible, and at that point, even a minor reduction in standard of living can do wonders. Living as if you're just slightly poorer than your money says you are is a borderline financial superweapon. The peace of mind that comes from knowing a random life upset (Like suddenly rising gasoline prices because of another ill-advised military adventure in the middle east) is not going to ruin you tends to more than make up for the loss of luxury and convenience from living in a 10% smaller home, driving a 10% cheaper car, going to restaurants 10% less, and so on.

What's more, this is not a commentary on poverty. (Of course, poverty is a real problem. The growth in wages, especially on the lower end hasn't been keeping up with the cost of living for a while now, presenting serious systemic problems.) This applies on every income level short of ultra-rich. The stories from couples living on double six-figure incomes (USD) yet still getting deeper into debt every year just boggle my mind, but this a fairly common reality in some circles.

If you realize just how badly enslaved you are by your addictions to luxury, convenience and status, you can live a much more serene, and ultimately even much richer, life.