Tertiary Temptation
For introverts
"When introverts run into a situation that their Dominant Function can't handle, they need to adapt by negotiating, going along with the limitations of low-bandwidth social interaction, or otherwise doing something that does not involve total control or understanding of the situation. The Tertiary Function provides justification for maintaining an Introverted approach directly opposite to the worldly expansiveness that the person is ready for."
"Tertiary Ni: "I can't possibly go along with this, 'cuz it's all a lie. It's all a set-up by the Man. I'd just be serving his interests and not my own. I'm not gonna be suckered by all this self-serving bull. No way, man, I gotta go my own way." Or "Why should I imitate the cool people? Despite their shiny clothes and social connections, they are still as vulnerable as anyone else.""
Introverted Intuition
"...tertiary Ni can give ISFPs the will to hold to a belief even when others don't agree with it..."
Ni is not all negative as a tertiary function though. You need to learn to use Ni and balance it with your Se. S like facts and detail, where N likes possibilities. S can shoot N down and N can shoot S down. If I am stuck and need help I turn to Ni. Whatever Ni comes up with I try and use Se to verify or prove it. Its like an N arguing with a S. We can shoot down there theories and possibilities with fact. They can shoot down something we believe to be fact with theory or the how and why. When in N mode I get these thoughts and immediatley have to use my Se and verify if they are true. With an Ne they can branch out without actually having data to support, To me Ni seems to need data or else it goes the wrong way. I get alot of data for Ni by learning why and how things work. Being introverted I read alot. I like theory that contains alot of data and facts that are known to be true. If I let my Ni take over though it makes me think that what my Ni comes up with as fact(become stubborn with what I think is fact). So to stay healthy as an Se and not let Ni take over we need to question our Ni and verify what it comes up with before we act on it.
To give an example. I see alot of N and S in my son(he is almost 5). He becomes very stubborn because he takes his N as fact. He will argue "I know you did this because of..." Using something Se as a reason. He is using N supported by S and believes what N decides to be a fact and becomes very stubborn and hard headed even when I prove him wrong with Se and his Fe comes out with a grunt. Eventually his hard headed ness goes away and out comes the sad/mad face, he knows he was wrong but doesnt want to admit defeat. Holy crap that was one of those "ah-ha" moments, tying together something I my Ni came up with and actual Se data.