The tertiary cognitive process of the INTJ is Introverted Feeling (Fi). It is referred to by Jung as, "child" or "Puer" meaning "boy" in Latin; puella meaning "girl". Jung used these terms to represent the archetypal child in us all. In this context, it means that the third position Cognitive Process is accessed in a "childlike" way. That is, it's not as well-developed as the top two (Ni and Te), and is prone to shifts in perspective, in Beebe's terms, it can be "inflated" or "deflated". Not as dramatic as manic-depressive mood swings, but somewhat similar.
In the case of INTJ, it means that our deeply-held inner values are usually not as well developed as our Ni and Te. Consequently, it's possible that we can become alternatively petulant or grandiose depending on whether our values are being questioned or supported.
I'm curious as to how other INTJs on this forum view this statement. Have you ever thought about how you view these shifts in perspective, e.g., highs/lows? Have you worried that you may have Bipolar tendencies or have you simply recognized this as part of who you are?