The opposite or "reverse" of how GG's likes it -- they don't write or keep any written forms of communication.
"We wrote on slates, and they had to be wiped off at the end of each day because the Gardeners said you couldn't leave words lying around where our enemies might find them. Anyways, paper was sinful because it was made from the flesh of trees.
We spend a lot of time memorizing things and chanting them out loud (60)."
Got a little bit side tracked of the mention of forgetting things.. and it's brought me to another example of GG's belief in nature and preserving it.