The Sacrifice of Wisdom
The second series of seven cards, eight to fourteen, are bounded in the TdM pattern by the two virtues Justice and Temperance, with a third virtue 'Fortitude' in the middle. The four other cards are split into two pairs in between the virtues, the first pair concerns the temporal [hermit/time] and its mutability [Wheel of Fortune]; the second to death, unnatural [hanged man] and natural [death]. These four in representing the temporal, mutable and destructable elements of life we could take as corresponding to the 'body', and suggest the three virtues correspond to the soul, which reaps the rewards of virtue after death [and note that temperance, following death, is given wings]. This split is in keeping with numerological symbolism, in which the number three is related to the 'soul' and four to the 'body'.
It is possible I suppose that the 'missing' virtue Prudence/Wisdom has been put aside for the of maintaining such a numerological scheme. However it has been demonstrated that the three virtues Justice, Fortitude and Temperance were considered and represented as a group on their own [see thread on prudence/wisdom
http://www.tarotforum.net/showthread.php?t=24836, the full context of which is still to open to research; so that it is not necessary to view it as 'missing' at all, but is simply not included as is the case with other representations of these three virtues whose context is yet to be fully understood. It is perhaps relevant that they are the three pythagorean virtues as the three=soul and four=body is also founded upon pythagorean number symbolism.
However, let us for speculations sake imagine that the fourth Platonic virtue Prudence/Wisdom is present but 'hidden'. I think the apparently post de Gebelin allocation to the Hanged Man could be interpreted with reference to Plato in a manner that supports the association with self sacrifice and martyrdom. In his 'Republic' Plato writes:
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"Now imagine what would happen if he went down again to take his former seat in the Cave. Coming suddenly out of the sunlight, his eyes would be filled with darkness. He might be required once more to deliver his opinion on those shadows, in competition with the prisoners who had never been released, while his eye sight was still dim and unsteady; and it might take some time to become used to the darkness. They would laugh at him and say that he had gone up only to come back with his sight ruined; it was worth no one's while even to attempt the ascent. If they could lay hands on the man who was trying to set them free and lead them up, they would kill him."
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Here Plato is obviously alluding to the fate of Socrates, in whom perhaps the neoplatonic Christian martyr Boethis found an exemplar while awaiting his own execution; during which time he wrote his neoplatonic treatise 'The Consolation of Philosophy' upon which Christianity drew so much.
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"In the world of knowledge, the last thing to be perceived and only with great difficulty is the essential Form of Goodness. Once it is perceived, the conclusion must follow that, for all things, this is the cause of whatever is right and goo; in the visible world it gives birth to light and to the Lord of Light, while it is itself sovereign in the intelligible world and the parent of intelligence and truth. Without having had a vision of this Form no one can act with wisdom, either in his own life or in matters of state."
"Then you may also agree that it is no wonder if those who have reached this height are reluctant to manage the affairs of men. Their souls long to spend all their time in that upper world.... Nor is it strange that one who comes from the contemplation of divine things to the miseries of human life should appear awkward and ridiculous when, with eyes still dazed and not yet accustomed to the darkness, he is compelled, in a law court or elsewhere, to dispute about the shadows of justice or the images that cast those shadows, and to wrangle over the notions of what is right in the minds of men who have never beheld Justice itself."
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Again, a reference to Socrates, who was taunted for his inability to defend himself in court.
If we take the hanged man then as Prudence/Wisdom, we may interpet it with reference to Plato as the descent of wisdom or the wise from the realms of the higher world to the material. A descent that not only entails self sacrifice but the risk of being killed, a martyr of wisdom.
ref: 'The Republic of Plato' chapter XXV:The Allegory of the Cave.
May I also recomment the excellent online 'O'Neill' library at
www.tarot.com. In relation the hanged man specifically:
http://www.tarot.com/about-tarot/library/boneill/hangedman
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O'Neill on the hanged man
But seeing the Hangedman image as representing punishment (secular or religious) does not consider the full complexity of the symbolism. The contrast between upright and inverted figures was not simply associated with punishment since both upright and inverted figures appear in Figures 9 and 12. In many accounts, sinners in hell will be turned upside down (Gorevich 1988). But in Late Medieval imagery and drama, the viewer knew that a significant transition had occurred when everything reversed – it was a kind of dramatic device to alert the viewer that they were now seeing action in the afterlife (Palmer 1992).
The most important account of this inversion occurs at the end of Dante’s Inferno. Dante and his guide Virgil have descended into the depths of hell in an upright position. But at the bottom of hell, Dante is turned upside down and begins the ascension through Purgatory to Paradisio. To Dante, the inversion experience was a turning of values upside down – a conversion experience required for further progress. Thus, the later occultists interpretation of the Hangedman as a reversal of values and a pivotal experience was quite familiar to the 15th and 16th century card-player through Dante’s account.
This image of being inverted as a necessary step in a spiritual path may seem foreign to a modern reader. But it would not have been foreign to the 15th century viewer of the early Tarot. They would have been familiar with the idea of the Fool turned upside down (Davidson 1996). Bernard of Clairvaux described the experience of the spiritual aspirant who had experienced the reversal of values (James 1953): "We are like jesters and tumblers, who, with heads down and feet up, exhibit extraordinary behavior ..."
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and also:
http://www.tarot.com/about-tarot/library/boneill/CT_Dante
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O'Neill on Dante
Bousset (1913) points out that the Gnostic myth of the Anthropos depicts the “first man” as thrown headlong into material existence. The myth is explicitly referred to in the Gnostic “Acts of Peter” (James, 1924) where Peter explains one of the reasons why he requested that he be crucified upside-down: “For the first man, whose image I bear, thrown downward with the head.”
So, at a critical turning point in The Divine Comedy, there may be a reference to a traditional Gnostic mythic concept. Dante was an iconoclast (Bemrose, 2000). It is easy to envision him as giggling for weeks over slipping in a heretical Gnostic image! But, at the same time, a single reference in a huge epic drama cannot be given unsceptical affirmation. This is because the image may also have a simple orthodox interpretation.
The orthodox interpretation is in Plato’s Timaeus (43e). Plato describes the confusion and the disorder of the newly incarnate soul. The "circles" of reason and passion in the soul are disrupted when it is yoked to a mortal body: " The circles barely held together...their motion was unregulated, now reversed, now side-long, now inverted. It was as when a man stands on his head, resting it on the earth, and holds his feet aloft by thrusting them against something; in such a case right and left both of the man and of the spectators appear reversed to the other party" (Hamilton and Cairns, 1938
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And on Neoplatonism:
http://www.tarot.com/about-tarot/library/boneill/neoplatonism
Kwaw