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"First comes the day
Then comes the night.
After the darkness
Shines through the light.
The difference, they say,
Is only made right
By the resolving of gray
Through refined Jedi sight."
- Journal of the Whills, 7:477

from The Force Awakens novel.

Here's a great fan interpretation:

http://i.imgur.com/67aWVMB.png

It's rumored we saw the Journal of the Whills in the Last Jedi trailer

Kys