2 Answers

  1. Look in forbidden books, because he himself gave a hint: “The truth can only be found in forbidden books. The rest are lying.”

    Seriously, a Google books search yielded a similar but somewhat less concise quote:

    De l'Esprit: or, essays on the mind, and its several faculties, HelvĂ©tius – 1759

    “Being once arrived at those general and simple principles, the knowledge of the facts, that bad raised us to them, would be no more than a frivolous science, and all the libraries filled with these facts would become useless”

    google.ru

  2. Officially, it sounds like ” Knowledge of some principles easily compensates for ignorance of some facts.” Maybe it's just like a statement not written down anywhere? I have met this many times in all sorts of collections of quotes and aphorisms.

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