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A window to the soul
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Let's start out by contrasting from a higher level. If the coin is the psyche, then MBTI and enneagram appear to approach the psyche from different sides of the same coin: MBTI is mainly concerning the conscious part of the psyche, and enneagram is concerning the unconscious (aka, instincts).Fi and Te are two sides of the same coin. Both are related to the gut instinct too. So yeah, there is definitely a connection.
All enneatypes concern instincts:
Heart or emotional instinct: 2, 3, 4
Head or intellectual instinct: 5, 6, 7
Gut or physical instinct: 8, 9, 1
Let's look at your comment about Fi and Te being on the same coin. Fi and Te are not always on the same coin. That statement only makes sense to me if you're talking about the coin being an IFP. We could contrast the IFP archetypes (Fi-dom self vs. Te-dom shadow) or we could contrast the default pattern of cognitive behavior for the IFP (Fi-dom vs. Te-inf). Please correct me if I'm wrong.
As far as I understand, Fi has nothing to do with gut (aka, physical) instincts when we're talking about MBTI. Nor is Fi directly related to a physical instinct function (i.e., Se) [where enneatype 8 'power' is concerned]; at least not that I can fathom at the moment. However, Te is! And here's an example of why: ENTJ's have tertiary Se, which they orient with to physically intimidate people for power, to get the control back when socially defined expectations are failing them. In that case, yes, they orient with their tertiary Se, which I understand ENTJ's describe as going with their "gut instincts".Fi and Te are two sides of the same coin. Both are related to the gut instinct too.
It might make sense to tie an Fi-dom ISFP with enneatype 9 because their secondary function is Se, but I wouldn't think any Fi-dom would fit enneatype 8 [Fi-Se combo of functional attitudes don't fit the enneatype 8 description; at all]. As I've tried to explore briefly in this post, I'm not finding a logical tie between 8 and Fi (specifically) without getting creative.
Agreed.No. Fi is about individual values and Te is used as the means to an end.
Agreed! Type 8 is concerning power and physical instincts, which describes the default pattern of cognitive function for the ETJ's more than any other type, in my opinion.8 would seem to best fit ETJ types