Jung discovered extroversion and introversion. Extroversion means,that concious is clenched on a object (and that's why they say that extrovert lives in a objective world). Introversion means that conciouss is clenched on a possibilitie what that object means. Object is made in conciousness from object into sign. It's subjective. That's why they say that introvert lives in a subjective world.
When concioussly we are doing with an object some task in our mind, we are extroverted. When we are thinking of things, what that object means, then we are introverted , we deal with the semantics of an object.
I found two urges, one primary and one secondary. The primary is stronger than the secondary is.
Word verted means movement, am I right? Extroversion means an urge to move in objective world. Introversion means an urge to move from objective world into semantical world. This is my Primary Urge.
Extrovert lives in the World of objects. He is clenched on objects. At the same time he has a need to withdraw wrom that external world into innerworld, world of meanings. It is less powerfull than the first one is and that is what I call The Second Urge. I'll make it clear.
On the other hand, introvert has a strong urge to solve tasks with the meanings of the object, f.e introvert using it's Ti ''This table is symmetrical, that's why it is at the same time geometrical image, it can't be used for sitting ,because it's ineligible.'' And at the same time, introvert has lower urge to become one with that object. For that lower urge, The Secondary Urge, introvert uses it's second function, it's extroverted function.
Because we live mostly either in external world or internal world, to live in opposite world, we have to learn some steps. That's why the second function concists from learned movements.
And now we're arriveing to what Sergei Ganin sayd :'' First function takes the idea, second one makes it seated.'' When extrovert is one with the object, he solves the task and then gives it a meaning. It's fuzzy do understand it so I'll give an example of ENTp, , thinking about the table at the diner. says that the table was just cleaned (objective) and then the says that this table is just one of the clean tables among other tables being cleaned some time ago (signs of object). INTj, , discovers that the table was similar to other tables at the diner and it's says that table will be cleaned again in the future. Hope that this explaines the roles of the first and the second function.
And finaly I have some thoughts about the subtypes. My idea is that the subtype is preferenceing the second urge strong enough to move the balance of extroversion/introversion. Introvert developes it's extroverted second function to become more strongly part with the objective world. When introvert is long time part from the external worl, he is extroverted subtype. This means also that introvert has a strong nessecery to end it's thoughts and this ending is creative ,creative means coming to an idea of using the right way, which is learned, to seat the task. I think , everibody has now an idea, why there are the first and the second function.
These are some thoughts I have made. When I'll get more notes and if this posting has a warm reception, I''ll write about the eight functions.
Any feedback is welcomed!