“There is no pain worse than ignorance and lack of intelligence.”
Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 165
Help us to complete the source, original and additional information
Muhammad al-Baqir 30
fifth of the Twelve Shia Imams 677–733Related quotes

“Don't make it worse by thinking it's more painful than it actually is.”
Source: The Boy in the Striped Pajamas
“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.)).

“There is no worse screen to block out the Spirit than confidence in our own intelligence.”

“It is worse still to be ignorant of your ignorance.”
Ne hoc quidem scire quod nescias.
Letter 53
Letters
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.

“Lack of certification hardly proves intelligence,” Will muttered.”
Variant: I am not a certified idiot—"
"Lack of certification hardly proves intelligence," Will muttered.
Source: Clockwork Princess