You should realize that your MBTI type does not tell you your complete personality, which is influenced by so many factors in life, such as upbringing, environment, and culture. It tells you only your general psychological disposition.
INFP: introverted feeling (Fi), extraverted intuition (Ne), introverted sensing (Si), extraverted thinking (Te)
ISTJ: Si, Te, Fi, Ne
- Cognitive Functions:
http://personalitygrowth.com/cognitive-functions/
- simplified explanation of functions @
https://answers.yahoo.com/question/index?qid=20141214035400AAvnXDy
"Te: thinks out loud, pragmatic, confrontational, needs objective proof, deductive logic[*];
Te: When you have to talk your ideas out-loud and then execute!;
Si: lives in the past, detailed-oriented, security-seeking, follows rules, goes by the book;
Si: When you're learning, recalling and comparing information!;
Ne: creativity-driven, new ideas, adds info to idea, 'scatter-brained', bored by routine;
Ne: When you're seeing new ideas and possibilities around you!;
Fi: conceals emotions, values identity, in touch with own feelings (over others)"
- DaveSuperPowers:
https://www.youtube.com/user/DaveSuperPowers/videos
*Some online sources say Te is deductive, while others say that it is Ti that is deductive, just so you know.
Perceivers vs. Judgers
xxxP temperaments tend to have an easier time enjoying the moment, going with the flow, thinking on their feet, demonstrating a quick wit, being spontaneous, and playing things by ear. This can be attributed to their intense focus on Se or Ne, which are not time-based functions. xxxJ temperaments tend to have an easier time planning things ahead, keeping track of time, following through with tasks, scheduling events, and being punctual. This can be attributed to their intense focus on Si or Ni, which are time-based functions. Percivers seek openess in the outside world, striving for an adaptable, flexible lifestyle; while Judgers seek closure in the outside world, striving for a decided, predictable lifestyle. Perceivers ("grasshoppers") are "in-time" people, whiles Judgers ("ants") are "through-time" people.
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Are you an "In-time" or "Through-time" person?:
http://www.bizbuzz.co.nz/articles/are-you-time-or-through-time