The pattern is roughly whether or not sustained effort has been put towards careful and above all objective thought on the matter. It's one of those subjects where there's the "obvious" intuitive answers that most everyone shares but try as you might you can't construct robust definitions and the more time you put into it the more fundamental problems you realize there are.

It's also one of those topics where many otherwise smart and capable people display a shocking lack of awareness of the limits of their own knowledge. When hundreds of years of philosophy is unable to produce anything concrete you should probably second guess any "self evident" answers you come up with.