•Why it earns a slot
Why it earns a slot: it is the ancient text that predicted its own medium's failure mode, a written dialogue arguing that writing destroys memory and produces false wisdom.
Two men lie down by a riverbank to read a speech about love, and Socrates ends up arguing that writing itself is a dangerous invention.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.