The Law of Perspectives:
There are two Global Perspectives on Life.
"Life is good with painful moments"
"Life is painful with pleasant moments."
At any one point in time you can have one perspective or the other but not both.
People can and do go back and forth between perspectives.
It is parallel to a painter who can start with a dark canvas or a light canvas but not with both at the same time.
There is no way to evaluate which perspective is better, because everything a person thinks and does comes from one of the perspectives and is "colored" by it.
The only possibility of an objective evaluation is if there is a third perspective or point of view from which to view the other two.
I think there is such a third point of view that does not combine the first two but grows out of them organically.