Looking for a source for quote

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**Dr. Temujin**

I've been searching for quite some time now for the source to the following quote:

Have we exhausted all possible ways to divine the future? How many scribes must toil to scratch their visions onto ancient parchments so that we might catch a glimpse of hope? Or are we to suffer only the pangs of despair as yet more horror is let loose on our dreams? Or does the seeking itself give birth to more insanity than man can cope?
The Dark Future Beckons!
Fear the unknown!

The first instance I saw it was in the TV Tropes page for 40k. It doesn't seem to appear in anything at all! No BRBs, no codexes, no FFG books, nothing! Maybe someone can point me in the direction of the original source?