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Katalepsis (Greek: κατάληψις, "grasping") is a term in Stoic philosophy for a concept roughly equivalent to modern comprehension.^[1] To the Stoic philosophers, katalepsis was an important premise regarding one's state of mind as it relates to grasping fundamental philosophical concepts, which was followed by the assent, or adherence to the truth thus understood.

According to the Stoics, the mind is constantly being bombarded with impressions (phantasiai).^[2] Some of these impressions are true and some false. Impressions are true when they are truly affirmed, false if they are wrongly affirmed. Cicero relates that Zeno would illustrate katalepsis as follows:

He would display his hand in front of one with the fingers stretched out and say "A visual appearance is like this"; next he closed his fingers a little and said, "An act of assent is like this"; then he pressed his fingers closely together and made a fist, and said that that was comprehension (and from this illustration he gave to that process the actual name of katalepsis, which it had not had before); but then he used to apply his left hand to his right fist and squeeze it tightly and forcibly, and then say that such was knowledge, which was within the power of nobody save the wise man.^[3]

Katalepsis was the main point of contention between the Stoics and the two schools of philosophical skepticism during the Hellenistic period: the Pyrrhonists and the Academic Skeptics of Plato's Academy. These Skeptics, who chose the Stoics as their natural philosophical opposites, eschewed much of what the Stoics believed regarding the human mind and one's methods of understanding greater meanings.^[4] To the Skeptics, all perceptions were acataleptic, i.e. bore no conformity to the objects perceived, or, if they did bear any conformity, it could never be known.^[5]

Notes

^ Charles Porterfield Krauth, William Fleming, Henry Calderwood, (1878), A vocabulary of the philosophical sciences, p. 589
^ Diogenes Laërtius (2000). Lives of eminent philosophers. Vol. VII: 49. Transl. R D Hicks. Cambridge, MA: Harvard University Press.
^ Cicero (1967). Academica. Vol. II: 144. Transl. H Rackham. Cambridge, MA: Harvard University Press.
^ See Ancient Greek Skepticism at the Internet Encyclopedia of Philosophy for information about katalepsis and the Skeptics' attack on it.
^ George Henry Lewes (1863), The biographical history of philosophy, Volume 1, p. 297

[1] Charles Porterfield Krauth, William Fleming, Henry Calderwood, (1878), A vocabulary of the philosophical sciences, p. 589

[2] Diogenes Laërtius (2000). Lives of eminent philosophers. Vol. VII: 49. Transl. R D Hicks. Cambridge, MA: Harvard University Press.

[3] Cicero (1967). Academica. Vol. II: 144. Transl. H Rackham. Cambridge, MA: Harvard University Press.

[4] See Ancient Greek Skepticism at the Internet Encyclopedia of Philosophy for information about katalepsis and the Skeptics' attack on it.

[5] George Henry Lewes (1863), The biographical history of philosophy, Volume 1, p. 297

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-{{short description|Stoic concept of the criterion of truth}}
+{{Short description|Concept in Stoic philosophy}}
 {{italics}}
+{{For|pathological body rigidity described with the same word|Catalepsy}}
-{{Stoicism sidebar}}
-'''''Katalepsis''''' ({{lang-el|κατάληψις}}, "grasping") incameron rich [[Stoicism|Stoic]] philosophy, meant [[Understanding|comprehension]].<ref>Charles Porterfield Krauth, William Fleming, Henry Calderwood, (1878), ''A vocabulary of the philosophical sciences'', page 589</ref> To the Stoic philosophers, ''katalepsis'' was an important premise regarding one's state of mind as it relates to grasping fundamental philosophical concepts, and it represents the Stoic solution to the [[problem of the criterion]].
+'''''Katalepsis''''' ({{langx|el|κατάληψις}}, "grasping") is a term in [[Stoicism|Stoic]] philosophy for a concept roughly equivalent to modern ''[[Understanding|comprehension]]''.<ref>Charles Porterfield Krauth, William Fleming, Henry Calderwood, (1878), ''A vocabulary of the philosophical sciences'', p. 589</ref> To the Stoic philosophers, ''katalepsis'' was an important premise regarding one's state of mind as it relates to grasping fundamental philosophical concepts, which was followed by the '''assent''', or adherence to the truth thus understood.
+According to the [[Stoicism|Stoics]], the [[mind]] is constantly being bombarded with impressions (''[[phantasiai]]'').<ref>
-==Stoicism==
-According to the [[Stoicism|Stoics]], the [[mind]] is constantly being bombarded with impressions (''[[phantasiai]]''). (An impression arising from the mind was called a ''[[Phantasma (philosophy)|phantasma]]''.)<ref>
 {{cite book
   | last = Diogenes Laërtius
@@ Line 14: / Line 13: @@
   | publisher = [[Harvard University Press]]
   | location =  Cambridge, MA
-}} VII.49
+  | volume=VII: 49
+}}</ref> Some of these impressions are true and some false. Impressions are true when they are truly affirmed, false if they are wrongly affirmed. [[Cicero]] relates that [[Zeno of Citium|Zeno]] would illustrate ''katalepsis'' as follows:
-</ref>
+<blockquote> He would display his hand in front of one with the fingers stretched out and say "A visual appearance is like this"; next he closed his fingers a little and said, "An act of assent is like this"; then he pressed his fingers closely together and made a fist, and said that that was comprehension (and from this illustration he gave to that process the actual name of ''katalepsis'', which  it had not had before); but then he used to apply his left hand to his right fist and squeeze it tightly and forcibly, and then say that such was knowledge, which was within the power of nobody save the wise man.<ref>
-Some of these impressions are true and some false. Impressions are true when they are truly affirmed, false if they are wrongly affirmed, such as when one believes an oar dipped in the water to be broken because it appears so.<ref name="lewes">George Henry Lewes, (1880), The history of philosophy: from Thales to Comte, page 360</ref> When [[Orestes]], in his madness, mistook [[Electra]] for a [[Erinyes|Fury]], he had an impression both true and false: true inasmuch as he saw something, viz., Electra; false, inasmuch as Electra was not a Fury.<ref name="lewes"/> Believing that the mind instinctively discriminated between real and false impressions, the Stoics said that one ought not to give credit to everything which is perceived, but only to those perceptions which contain some special mark of those things which appeared.<ref name="levin">Thomas Woodhouse Levin, (1871), ''Six lectures introductory to the philosophical writings of Cicero'', page 71</ref> Such a perception then was called a {{lang|el|kataleptic phantasia}} ({{lang-el|φαντασία καταληπτική}}), or comprehensible perception.<ref name="levin"/> The {{lang|el|kataleptic phantasia}} is that which is impressed by an object which exists, and which is a copy of that object and can be produced by no other object.<ref name="lewes"/>
-[[Cicero]] relates that [[Zeno of Citium|Zeno]] would illustrate ''katalepsis'' as follows:
-<blockquote>
-he would display his hand in front of one with the fingers stretched out and say "A visual appearance is like this"; next he closed his fingers a little and said, "An act of assent is like this"; then he pressed his fingers closely together and made a fist, and said that that was comprehension (and from this illustration he gave to that process the actual name of ''katalepsis'', which  it had not had before); but then he used to apply his left hand to his right fist and squeeze it tightly and forcibly, and then say that such was knowledge, which was within the power of nobody save the wise man<ref>
 {{cite book
   | last = Cicero
   | author-link = Cicero
   | year = 1967
-  | title = De natura deorum academica
+  | title = Academica
   | others = Transl. H Rackham
   | publisher = [[Harvard University Press]]
   | location =  Cambridge, MA
+  | volume =II: 144
-}} II.145
-</ref>
+}}</ref>
 </blockquote>
+''Katalepsis'' was the main point of contention between the Stoics and the two schools of [[philosophical skepticism]] during the [[Hellenistic period]]: the [[Pyrrhonism|Pyrrhonists]] and the [[Academic Skepticism|Academic Skeptics]] of [[Platonic Academy|Plato's Academy]]. These Skeptics, who chose the Stoics as their natural philosophical opposites, eschewed much of what the Stoics believed regarding the [[human mind]] and one's methods of understanding greater meanings.<ref>See [http://www.iep.utm.edu/s/skepanci.htm ''Ancient Greek Skepticism''] at the [[Internet Encyclopedia of Philosophy]] for information about ''katalepsis'' and the Skeptics' attack on it.</ref> To the Skeptics, all perceptions were [[acatalepsy|acataleptic]], i.e. bore no conformity to the objects perceived, or, if they did bear any conformity, it could never be known.<ref>George Henry Lewes (1863), ''The biographical history of philosophy'', Volume 1, p. 297</ref>
-''Katalepsis'' was the main bone of contention between the Stoics and the two schools of [[philosophical skepticism]] during the [[Hellenistic period]]: the [[Pyrrhonism|Pyrrhonists]] and the [[Academic Skepticism|Academic Skeptics]] of [[Platonic Academy|Plato's Academy]].<ref name="levin"/> These Skeptics, who chose the Stoics as their natural philosophical opposites, eschewed much of what the Stoics believed regarding the [[human mind]] and one's methods of understanding greater meanings.<ref>See [http://www.iep.utm.edu/s/skepanci.htm ''Ancient Greek Skepticism''] at the [[Internet Encyclopedia of Philosophy]] for information about ''katalepsis'' and the Skeptics' attack on it.</ref> To the Skeptics, all perceptions were [[acatalepsy|acataleptic]], i.e. bore no conformity to the objects perceived, or, if they did bear any conformity, it could never be known.<ref>George Henry Lewes, (1863), ''The biographical history of philosophy'', Volume 1, page 297</ref>
 ==Notes==
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 {{Ancient Greek philosophical concepts}}
 [[Category:Concepts in ancient Greek epistemology]]
-[[Category:Concepts in ancient Greek metaphysics]]
 [[Category:Concepts in ancient Greek philosophy of mind]]
-[[Category:Concepts in logic]]
-[[Category:Concepts in metaphilosophy]]
 [[Category:Stoicism]]
-[[Category:Theories in ancient Greek philosophy]]