Similarly, a lot of people start out thinking that money will solve their problems, and it does solve a lot of problems, but people get onto the treadmill of earning more and spending more, when happiness comes from contentment with what you have, not discontent and constant struggle to "get more stuff"

Not saying don't be ambitious, not saying don't try, etc - just saying that once you've reached a level of not having to worry about essentials (food, clothing, housing, water, etc) with enough "headroom" to also have fun in life, do you really need more? Will you be happier with more? Really happier? Or will you just get a short burst of happiness, followed by hollowness as you realise that no matter how much you earn, you can blow all of it on crap.