“Every other knowledge is harmful to him who does not have knowledge of goodness.”

— Michel De Montaigne

Book I, Ch. 25
Essais (1595), Book I
Source: The Complete Essays

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Michel De Montaigne 264

(1533-1592) French-Occitan author, humanistic philosopher, … 1533–1592

Antonio Porchia (1885–1968) Italian Argentinian poet

Mi dignidad le pide a quien no me hace daño que no me haga daño, y a quien me hace daño no le pide nada.
Voces (1943)

“Bodily exercise, when compulsory, does no harm to the body; but knowledge which is acquired under compulsion obtains no hold on the mind.”

Plato (-427–-347 BC) Classical Greek philosopher

“To free a man from error is to give, not to take away. Knowledge that a thing is false is a truth. Error always does harm; sooner or later it will bring mischief to the man who harbors it.”

Arthur Schopenhauer (1788–1860) German philosopher

"Religion: A Dialogue."
Variant translation: To free a man from error does not mean to take something from him, but to give him something.
Essays
Source: Essays and Aphorisms
Context: To free a man from error is to give, not to take away. Knowledge that a thing is false is a truth. Error always does harm; sooner or later it will bring mischief to the man who harbors it. Then give up deceiving people; confess ignorance of what you don't know, and leave everyone to form his own articles of faith for himself. Perhaps they won't turn out so bad, especially as they'll rub one another's corners down, and mutually rectify mistakes. The existence of many views will at any rate lay a foundation of tolerance. Those who possess knowledge and capacity may betake themselves to the study of philosophy, or even in their own persons carry the history of philosophy a step further.

“Knowledge in and of itself is devoid of good and evil. Knowledge, however, does not necessarily make human beings wiser. In fact, knowledge without wisdom can be outright dangerous.”

Newton Lee American computer scientist

Google It: Total Information Awareness, 2016

“One who does not use his intelligence will not succeed and one who does not use his knowledge will have no intellect. One who understands will attain nobility and excellence, and one who is tolerant will triumph. Knowledge is a shield (against evil), truth begets honour and ignorance disgrace, understanding is distinction, generosity is salvation and good manners command love and respect.”

Ja'far al-Sadiq (702–765) Muslim religious person

Muhammad Kulayni, Usūl al-Kāfī - The Book of Intellect and Ignorance.
Regarding Knowledge & Wisdom, General

“What does opening your eyes and realizing your vulnerability have to do with the knowledge of good and evil?”

Jordan Peterson (1962) Canadian clinical psychologist, cultural critic, and professor of psychology

Here's the key: You know you're vulnerable. No other animal knows that. You know what hurts you, because you're vulnerable. And now that you know what hurts you, you can figure out what hurts someone else. And as soon as you know what can hurt someone as, and you can use that, then you have the knowledge of good and evil. Well it's a pretty good trick that the snake pulled because it doesn't seem like the thing that we would have exactly wanted if we knew what the consequence was going to be. As soon as a human being is self conscious and aware of his nakedness, then he has the capacity for evil. That's introduced into the world right at that point."
Concepts