A door
Understand the ideas
The handful of things he and Vault came to believe are true and useful.
This door opens soon
This part of Epilogue is still being written. The ideas are alive and in daily use; putting them into words a first-time reader can trust takes care, and that care is being taken.
When this door opens, each idea will get its own short page, written for someone meeting it for the first time. No background needed, ever.
Until then, the front door is always open.