
Originally Posted by
Galen
Well I think the idea is that people are at their healthiest when they can strike a balance between all three instincts. The stackings simply orient the relative priority depending on the individual.
On the Enneagram Explorations facebook page, I recall Katherine Fauvre say how the last instinct is actually the most easily satisfied of the three. An Sx-primary will require a higher level of active engagement in their lives than the Sx-last, who only really needs a little bit in their lives to be satisfied. So the Sp-first can't go too long outside of their personal space without feeling unbalanced, while the Sp-last can largely ignore or forget about their own space and focus more of their attention outward. In this way, the last instinct can be just as much a strength as a weakness, in the same sense that the primary instinct can be a detriment when left unchecked.