A bit from my son’s fifth grade vocabulary book that I think is neat.
[The word liberty is] formed from the Latin liber, which means “free.” It’s interesting to note that the Latin word for “book” is also liber. (A Library is a place where books are kept.) There is a clear connection between books and freedom. A person who cannot read is in a kind of prison; learning to read sets the mind free to explore the world and everything in it.
Cool, huh? That would explain why it was illegal to teach slaves to read.