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[As time passed, the markings of the Celestial Chariot had faded. The threads of destiny grew thin, and the Book of Truth no longer congealed... Should the Celestial Chariot not reappear, a disaster of a new epoch is certain to come]
Endymion said:
[Because (muted) is not a foreseeing god. The principles she set in the past will eventually become outdated... One day, the Book of Truth will cease to appear]
In layman's terms, it means that the relic seal left by the "Charioteer" is almost out of sealing wax, or you could say it's nearly worn out.
From the era of the Skeleton Lord to the Mirror's, no new Books of Truth had emerged... Perhaps it's not because new truths weren't arising, but because the "automatic admission mechanism" left by the "Charioteer" is no longer applicable to the modern world's rules.
On reflection, the Book of Truth about "The Machine" condensed in The Holy Nation is indeed related to Annan's invention of the internal combustion engine.