Ignorance
Overview
 
Ignorance is a state of being uninformed (lack of knowledge
Knowledge
Knowledge is a familiarity with someone or something unknown, which can include information, facts, descriptions, or skills acquired through experience or education. It can refer to the theoretical or practical understanding of a subject...

). The word ignorant is an adjective describing a person in the state of being unaware
Awareness
Awareness is the state or ability to perceive, to feel, or to be conscious of events, objects or sensory patterns. In this level of consciousness, sense data can be confirmed by an observer without necessarily implying understanding. More broadly, it is the state or quality of being aware of...

 and is often used as an insult. Ignoramus is commonly used in the US, the UK, and Ireland as a name of someone who is willfully ignorant.

Ignorance is distinguished from stupidity
Stupidity
Stupidity is a lack of intelligence, understanding, reason, wit, or sense. It may be innate, assumed, or reactive - 'being "stupid with grief" as a defence against trauma', a state marked with 'grief and despair...making even simple daily tasks a hardship'....

, although both can lead to "unwise
Wisdom
Wisdom is a deep understanding and realization of people, things, events or situations, resulting in the ability to apply perceptions, judgements and actions in keeping with this understanding. It often requires control of one's emotional reactions so that universal principles, reason and...

" acts.

Writer Thomas Pynchon
Thomas Pynchon
Thomas Ruggles Pynchon, Jr. is an American novelist. For his most praised novel, Gravity's Rainbow, Pynchon received the National Book Award, and is regularly cited as a contender for the Nobel Prize in Literature...

 articulated about the scope and structure of one's ignorance: "Ignorance is not just a blank space on a person's mental map.
Quotations

Ignorance is preferable to error, and he is less remote from the truth who believes nothing than he who believes what is wrong.

Thomas Jefferson, Notes on the State of Virginia (1781-1785), Query 6.

If a nation expects to be ignorant and free, in a state of civilization, it expects what never was and never will be.

Thomas Jefferson, Letter to Colonel Charles Yancey (January 6, 1816).

Bigotry is the disease of ignorance, of morbid minds; enthusiasm of the free and buoyant. Education & free discussion are the antidotes of both.

Thomas Jefferson, Letter to John Adams (August 1, 1816).

To be conscious that you are ignorant is a great step to knowledge.

Benjamin Disraeli, Sybil: Or, The Two Nations (1845) p. 36.

Ignorance is death. A closed mind is a catafalque.

Anna Quindlen, How Reading Changed My Life, (New York: Ballantine Books, 1998), p. 69.

If one neglects the laws of learning, a sentence is imposed that he is forever chained to his ignorance.

Sterling W. Sill, The Power of Believing, (1968), p. 29.

There are three degrees of comparison: stupido, stupidissimo, and tenore.

Pietro Mascagni, in Scott Beach, Musicdotes, (Berkeley, CA: Ten Speed Press, 1977), p. 94.

To be ignorant of one's own ignorance is to be in an unprogressive, uninspired state of existence.

David O. McKay, Pathways To Happiness, (1957), pp. 351-352.

If ignorance is bliss, then knock the smile off my face.

Zack de la Rocha, "Settle for nothing now", Rage Against the Machine (album), 1992

 
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