There are several websites that talk about this and I am not going to present a different point of view. I am just going to present the same set of facts in a more creative manner.
I just posted about “Happiness and Expectations”; and given that I was allowed to choose only one title of the post, I want to present that this is also the Mantra to Happiness – no matter how difficult it is to carry out in life, but this is the way to do it.
Check out my post “Expectations and Happiness are inversely proportional“. It seems this is an a Rule/Theorem that I am the first one to think about. Search for this phrase on Google and you will see this as the 2nd relevant result.