Other typology enthusiasts have made this link too and it relates more to the Ti-Fe(Fe-Ti) and Te-Fi(Fi-Te) axes. Ti-Fe are 'warmer' on the outside but 'colder' the deeper you dig into their psyche. It's the opposite with Te-Fi.
It's true for me. I'm amicable and easy going on the outside. I'm accommodating enough. On the outside I don't seem 'cold' (but not extremely warm), more like lukewarm, fun, and kind of a goofball. But 'inside' I'm calm, calculating, and analytical. Contrast this with the INTJ stereotype being 'rigid' on the outside always appearing strategic and measured with repressed emotions. Inside, INTJs are firebrands and contain a lot of passion.
INFJ - cold on outside, warm and fuzzy on the inside
INFP - warm and fuzzy inside and out
INTP - warm on the outside, hard as a rock inside
INTJ - cold and hard inside and out
Yet another set of questionable generalizations.
Hope is the denial of reality. It is the carrot dangled before the draft horse to keep him plodding along in a vain attempt to reach it. We should remove the carrot and walk forward with our eyes open. -- Raistlin Majere