Read it ?
Or teach it like Zero did?
Before I retired I kept a small pocket version like Byrd did, though I am sure he never read it. I also had a copy at eye level above my desk for times when I was too lazy to reach into my pocket.
Didn’t sleep through civics in Jr high when it was taught.
Audited a course on it in college.
Also swore an oath too it.
Ditto.