Might it have been this one?

Setting aside critiques of Mr Money Mustache, this is grounded in hard math and is the result of "having enough". In the developed world, "having enough" is easier than ever, yet the culture insists on trying to achieve even more, having more money, more house, more children, etc. Whereas the general notions of evaluating what brings value or happiness (see Marie Kondo: "ask yourself if it sparks joy") is more in like with "working to live, rather than living to work".

There's an equivalent maxim in vehicle engineering to that chart, something along the lines of "lightness begats lightness", and refers to how shaving off weight from an automobile allows reducing the engine power or the brake size, which further allows weight reductions, etc. The eventual result is having only the essentials in places that matter (eg unsprung weight, rotational mass) in an optimized harmony. Personal finance can follow the same maxim.

"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away" (usually ascribed to Antoine de Saint-Exupery)

Yeah, figuring out what you need and what you can live without can make decisions very empowering.

The other poster mentioned the FIRE chart by MMM, so I'll take another angle on it. This site shows areas by cost of living. If you know how to estimate income generation from investments (~3% is a good rule of thumb before retirement age, 4% thereafter), you can find a place you can retire to if you have a few hundred thousand dollars/euros. If you're fine with a BR apartment, there are options as low as $600/month ($180-240k investments).

What I mentioned is called "Batista FI", so called because some parttime barista jobs provide medical benefits for even part-time work in the US. The idea is you save enough that you can live comfortably on part-time income and still meet your longer term retirement goals.

My point is the lower your expectations are for retirement, the earlier you can get there. And knowing you can retire can make working more pleasant because it's a choice instead of a necessity.