--- title: "1 Mental Activity Quotes By Arthur Koestler" description: "1 Mental Activity quotes by Arthur Koestler. Plus more from Arthur Koestler and more Mental Activity sayings from other authors." image: "https://sms4smile.com/quotes/i/144/arthur-koestler-1903_accustomed_of-all-forms-of-mental-activity-the-most_1784668.jpg" --- > [Of all forms of mental activity, the most difficult to induce even in the minds of the young, who may be presumed not to have lost their flexibility, is the art of handling the same bundle of data as before,…](https://sms4smile.com/quotes/arthur-koestler/of-all-forms-of-mental-activity-the-most-difficult-to-induce-even-in/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) [Image](https://sms4smile.com/quotes/i/144/arthur-koestler-1903_accustomed_of-all-forms-of-mental-activity-the-most_1784668.jpg) ## More by Arthur Koestler > [The inner defenses are unconscious. They consist of a kind of magic aura which the mind builds around cherished belief. Arguments which penetrate into…](https://sms4smile.com/quotes/arthur-koestler/the-inner-defenses-are-unconscious-they-consist-of-a-kind-of-magic/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The temptations of God were always more dangerous for mankind than those of Satan.](https://sms4smile.com/quotes/arthur-koestler/the-temptations-of-god-were-always-more-dangerous-for-mankind-than/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The greatest temptation for the like of us is: to renounce violence, to repent, to make peace with oneself. Most revolutionaries fell before this…](https://sms4smile.com/quotes/arthur-koestler/the-greatest-temptation-for-the-like-of-us-is-to-renounce-violence-to/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The revolutions of thought which shape the basic outlook of an age are not disseminated through text-books- they spread like epidemics, through contamination by…](https://sms4smile.com/quotes/arthur-koestler/the-revolutions-of-thought-which-shape-the-basic-outlook-of-an-age/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The moment of truth, the sudden emergence of a new insight, is an act of intuition. Such intuitions give the appearance of miraculous flushes,…](https://sms4smile.com/quotes/arthur-koestler/the-moment-of-truth-the-sudden-emergence-of-a-new-insight-is-an-act/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [Coincidence may be described as the chance encounter of two unrelated causal chains which - miraculously, it seems - merge into a significant event.](https://sms4smile.com/quotes/arthur-koestler/coincidence-may-be-described-as-the-chance-encounter-of-two-unrelated/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The more original a discovery, the more obvious it seems afterwards.](https://sms4smile.com/quotes/arthur-koestler/the-more-original-a-discovery-the-more-obvious-it-seems-afterwards/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [“Revolutionary theory had frozen to a dogmatic cult, with a simplified, easily graspable catechism, and with No. 1 as the high priest celebrating the Mass.”](https://sms4smile.com/quotes/arthur-koestler/revolutionary-theory-had-frozen-to-a-dogmatic-cult-with-a-simplified/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [Coincidence may be described as the chance encounter of two unrelated causal chains which](https://sms4smile.com/quotes/arthur-koestler/coincidence-may-be-described-as-the-chance-encounter-of-two-unrelated-2/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The more backwoodish a social group, juvenile or adult, the stricter its conception of the normal, and the readier it will ridicule any departure…](https://sms4smile.com/quotes/arthur-koestler/the-more-backwoodish-a-social-group-juvenile-or-adult-the-stricter/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [As modern physics started with the Newtonian revolution, so modern philosophy starts with what one might call the Cartesian Catastrophe. The catastrophe consisted in…](https://sms4smile.com/quotes/arthur-koestler/as-modern-physics-started-with-the-newtonian-revolution-so-modern/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [If one looks with a cold eye at the mess man has made of history, it is difficult to avoid the conclusion that he…](https://sms4smile.com/quotes/arthur-koestler/if-one-looks-with-a-cold-eye-at-the-mess-man-has-made-of-history-it/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The ultimate truth is penultimately always a falsehood. He who will be proved right in the end appears to be wrong and harmful before…](https://sms4smile.com/quotes/arthur-koestler/the-ultimate-truth-is-penultimately-always-a-falsehood-he-who-will-be/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The real achievement in discoveries... is seeing an analogy where no one saw one before... The essence of discovery is that unlikely marriage of…](https://sms4smile.com/quotes/arthur-koestler/the-real-achievement-in-discoveries-is-seeing-an-analogy-where-no-one/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) > [The jester is brother to the sage.](https://sms4smile.com/quotes/arthur-koestler/the-jester-is-brother-to-the-sage/) [Arthur Koestler](https://sms4smile.com/quotes/author/arthur-koestler/) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "ItemList", "@id": "https://sms4smile.com/quotes/about/mental-activity/arthur-koestler/#itemlist", "name": "1 Mental Activity Quotes By Arthur Koestler", "numberOfItems": 1, "itemListElement": [ { "@type": "ListItem", "position": 1, "item": { "@type": "Quotation", "text": "Of all forms of mental activity, the most difficult to induce even in the minds of the young, who may be presumed not to have lost their flexibility, is the art of handling the same bundle of data as before, but placing them in a new system of relations with one another by giving them a different framework, all of which virtually means putting on a different kind of thinking-cap for the moment. 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