If you are truly an INFJ, you will remain one. And, you will always remain who you are. But, that shouldn't mean you are stagnant and don't change. A full, vibrant life of willingly accepted challenge, and the ability to experience it fully, means that you are always changing. That's called growth.
I agree with this.
At one hand you shouldn't change yourself to that extend that you don't feel like you anymore. Because one way or the other it will bounce back to you and you'll turn into your true self again
on the other hand, you can't stay exactly yourself. Interactions with others in daily life will always aquire some changes in your behaviour. Everybody has to do this in order to find common ground. And this kind of changes helps you to grow as a person, to broaden your personality. And the more you do this the better you are able to change and handle different kinds of situations
also we can have adopted personality treads, habits, likes and dislikes, opinions and values from others. Are they then throughly our identity? And if these treads prevent you from reaching your full potential, wouldn't it be better for you if you changed them?
for example I have the habit to react very defensively when someone talks to me in a dominant way. Now my boyfriend often comes across as dominant and triggers that reaction with me and he wants me to change that. I now have to options
1. I don't want to change my behaviour since that is who I am, so eventualy I break up with him
2. I can look into that behaviour and ask myself some questions: where does that behaviour comes from? Is it something that defines my character or is it a behaviour that I adopted as a mechanism to survive? Does this behaviour works with me or against me. Is my boyfriend realy trying to dominate me or is it just an misinterpretation of me?
In my case I think I adopted this behaviour in my childhood. My father has always been very dominant towards me. My opinion was always crashed and burned by him. Now that I'm older, I have realised that my opinion do count and I absolutely don't want to get stuck in that same situation again, therefore my strong reaction. But my boyfriend is not my father, he is not trying to dominate me. The problem is that he has a very direct way of talking and I'm sensitive to that.
So now we decided that he will try to be less direct and listen more and I on the other hand will try to stay calm, ask for more information and not jump to conclusions. In this way we both change our behaviour but we will both grow
so you always have to find the balance between change and remaining yourself. Change the treads that work against you but keep the treads that truly belong to you