Guardian Camwar, in Ch. 4 : the cooper<!-- p. 42 -->
Source: The Visitor (2002)
Context: You asked for wisdom? Hear these words. Nothing limits intelligence more than ignorance; nothing fosters ignorance more than one's own opinions; nothing strengthens opinions more than refusing to look at reality.
“Nothing is more frightful than to see ignorance in action.”
Es ist nichts schrecklicher als eine tätige Unwissenheit.
Maxim 542, trans. Stopp
Variant translation by Saunders: Nothing is more terrible than ignorance in action. (231)
Maxims and Reflections (1833)
Original
Es ist nichts schrecklicher als eine tätige Unwissenheit.
Maxims and Reflections (1833)
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Johann Wolfgang von Goethe 185
German writer, artist, and politician 1749–1832Related quotes

“In such business
Action is eloquence, and the eyes of th’ ignorant
More learned than the ears.”

“There is nothing more horrifying than stupidity in action.”

“Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.”
Source: 1960s, Strength to Love (1963), Ch. 4 : Love in action, Sct. 3

“Goethe; or, the Writer,” pp. 271-272
1850s, Representative Men (1850)

“Nothing is more humiliating than to see idiots succeed in enterprises we have failed in.”
Rien n'est humiliant comme de voir les sots réussir dans les entreprises où l'on échoue.
Pt. 1, Ch. 5
Sentimental Education (1869)
“No tool is more beneficial than intelligence. No enemy is more harmful than ignorance.”
http://encarta.msn.com/quote_561557126/Intelligence_No_tool_is_more_beneficial_than.html
The Book of Guidance into the Lives of the Twelve Imams, 1981, "The Life of the Commander of the Faithful" (I. K. A. Howard (tr.)).