I used to feel like I was smarter than everyone else. I had cognitive and IQ tests done growing up and more recently, placement testing for college and the like. It all suggests I'm way up there, at least, reinforcing the way I thought about intelligence.
My interactions with people have gone very differently these last 8 years. I don't think about other people the way that I used to. I don't even perceive intelligence or lackthereof. I'm not sure the very concept of intelligence as an intrinsic attribute even makes any sense, anymore. I'm sure there are physiological variations between different human brains, but I'm not so sure that has any relationship to what we're actually assessing, when we give someone an IQ test or judge them for what they express.
People learn what their lives have taught them. I see everyone as having their own cascading chain of lived experiences and so much of what they're aware of, what they know and understand, is predicated on the life they've lived. What people are capable of can be very different than what they're motivated to do, and that includes how people use their brains. What they think a lot about, what they don't. Our minds develop around how we've learned to use them. As I get to know people these days, I can't compare my intelligence to theirs. I just see people with different lived experiences than my own.
Unfortunately, this has also meant that I can no longer use my ideas about intelligence to prop up my battered self-esteem. I've practiced a lot of ruminating in my life, but I'm often an idiot when it seems to count most. I think what we call "intelligence" is complicated. Someone else might not think about it at all. One is not more intelligent than the other.