What if I said feeling is an affective state? It results in judgment: you're affected this way so you know something is "negative" or you're affected that way so you know something is "positive". As to what is "Feeling" under Jung, dunno, haven't looked it up.
(That is an INTJ speaking?)This exchange didn't have to be so adversarial.
A genuine, dyed-in-the-wool, card carrying INFJ I know often speaks in terms of "my thinking" and "this is true" and so on. (She also says things like "I just know...", but be that as it may because I sometimes say things like that too.) And if I wanted to have a new one ripped for me I could attempt to slag off her thinking as "Ya, it's all just your subjective opinion, boo!" To which she would, after nailing my feet to the floor and gently placing hot coals in my gouged out eye sockets, reply, "that I process my impressions and order them via a judgment function that pays attention to what is and is not real means I am just as rational as you, and if you want to test anything I say, you are more than welcome to have your ass handed to you when we both find out I was right all along."
I have the strong impression that feeling judgment in an INFJ is hardly so superficial as "I just feel it." More like, "I just feel it, and it's stood the test of a huge amount of information I have stored and processed about people and what they really do." Or something like that. (I'm an amateur so decide for yourself if any of that makes sense.)
Short version: according to the normal, non-MBTI definition of the word "think", INFJs do a very great deal of thinking.
Is the following a reasonable short-hand test for INTJ vs INFJ?
"Do you think about people you know or about the ideas behind your work?"