What's the smartest or most insightful thing you figured out as a kid that stays with you today?

No one can tell me who I am, but me.

I am an infinitesimal cluster of neurons inhabiting a large body, and none of us have any idea what the fuck we're doing.

The universe is far larger than I can comprehend.

As far as revelations when I was 10 goes, that's about it. I didn't know about girls or sex yet.