This comes from "The history of western philosophy" by Bertrand Russell. "Like theology, it consists of speculations on matters as to which definite knowledge has, so far, been unascertainable." What confuses me is "has, so far, been unascertainable", what is the subject of the has here? And how to understand as to which?

  • I’m voting to close this question because mistakes happen. Mar 8, 2021 at 4:30
  • @YosefBaskin: Am I missing something? I see no "mistakes" - just Russell being a bit "verbose" and "convoluted", as usual. (Though I will admit I really don't like as to there, and would much prefer regarding myself.) Mar 8, 2021 at 13:32
  • The OP wrote a comment of mistaking "definite" for define. Mar 8, 2021 at 14:26

1 Answer 1


Knowledge has so far been unascertainable.

“As to which” means “regarding which” (matters)

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