This article gets into some of the actual differences between INFJ and INFP as Particular Melancholic and Particular Phlegmatic types respectively.
They are both of the class of NF temperaments, which I class as General Melancholics.
I relate this General Melancholic class to the Romantic movement that had its ascendancy in the 1800s.
INFJ and INFP are more or less alike in this broad “Romantic” way.
I then move on to the decisive cleaving differences between them in the way they “particularize” the concerns of their General class (NF).
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It could be the key to you deciding between INFJ and INFP once and for all.
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