I've been through many of these comparison threads, and read numerous profiles on the two types, but for some reason the points of contention between INFP and INFJ are often inverted in various descriptions. This has left me quite confused about which trait belongs to which type. It might be an external vs. internal aspects of the same traits present in both types, but expressed differently, but I'm really not sure. The traits that are often flip-flopped have to do with how much of self is revealed, how much certitude of values is possessed, how much tolerance, how easily offended, etc. I really like both types. I realize this is not a particularly helpful post except that it represents those who are confused by categorizing the differing points of contention.