Couldn't agree more. It's such a tough concept to fully embrace and one that I constantly have to remind myself of.
Society today is so money hungry that I constantly see people chasing money as a means to find happiness or fulfillment.
As you said, money can bring a certain level of happiness, after a certain point, it's all diminishing returns.
What I've found is that when you can find happiness and beauty in the process, happiness will come.