Fi creates an internal framework of what is ideal, and Ti creates one for what is logical. Both deal in terms of concepts more than what works in reality. Although Ti has the advantage of dealing in realms that can be proven more easily in the real world, which adds a dimension of objectivity that Fi does not have because of what it concerns itself with. Both are working off of principles though - where these come from is debatable. Jung suggests the unconscious mind, which brings forth archetypes (something like "mental instincts") as the basis for the Ti-dom's logic or the Fi-dom's values. So there is an almost innate basis for truth, be it logical or moral, for each, and the individual interprets these images into something able to be understood rationally - concepts & frameworks & ideas & values, etc. Everyone has this, but Ti & Fi doms are most in touch with this aspect of it.
Using Ne is how both INxPs will take in information and compare it to their reasoning so as not to be in a bubble- morbidly obsessed with your own thoughts/feelings without regard for the external world. Both Ti & Fi types who are not using Ne well & are in a bubble will seem very biased and out of touch with reality. When I think of ludicrous conspiracy theories, I think of an unbalanced INTP . There is such a bias for their internal theory they've denied any external evidence to the contrary and seem delusional.
So what does this have to do with the OP? I see that your thinking is turned inward - you need logical consistency in your ideas and others' ideas. Your feeling is turned outward - it's focused on your relationships with people and adjusts to the external need. Your Ti is guiding your Fe basically - your values have to be consistent with your logical framework. They don't exist for the sake of themselves, they exist because it makes sense to have good relations with people. That furthers Ti's aims in many ways. However your logical analysis is not to serve an external purpose.Originally Posted by Jung on Ti
In an INFP, Te is used to support Fi. We make logical judgments based on external criteria, but we tend to focus on facts that support our idealistic feeling theories. Our understanding of what makes sense logically will adjust to the external facts once we see they are solidly proven in reality; but our acceptance of some facts as unchangeable can be in terms of how they relate to our ideals. However, our ideals are formed for their own sake. They do not need to be validated by anything external.
And please note I'm talking about the Ji & Je functions without discussing the Pe & Pi functions, which makes them sound a bit extreme (there's that bubble again).