Originally answered as a requested question on Quora!
I loooooove INTJs! One of my fav. MBTI types. Super adorable*, (*)if you understand their hearts ❤ Patience and understanding is the key with them. Also, give them their space. As an INFP, I kind of bombard into their territory uninvited 😛 YET, they never make me feel unwelcome.
I wrote an open letter to the INTJs here: A letter to the INTJs in my life