Independence, derived primarily from strongly introverted Thinking, leads to perhaps the most difficult aspect (for others) of the INTP, namely stubbornness. If an INTP is pushed into doing something he will automatically resist. The reason for the resistance is simply that any action must first be filtered by the Ti, guided by the Ne. He must be given the chance to reach an independent decision, approving or rejecting the action. Hence, he must withdraw to allow the analysis process to work. If withdrawal is not allowed then stubborn resistance is the inevitable result. However, others may not always find the INTP excessively stubborn, since the decision-making process can sometimes be rapidly accelerated when intuition takes the upper hand. The best way to get an INTP to do something is to suggest the idea as an option and let him sleep on it. Ultimately, the INTP must always believe that it is his decision. Once he is satisfied that the decision was independently reached, then he is content.
But generally, we need to reach our own conclusions, come to our own decisions. We can't really accept things told by others that don't make sense to us. In this way we can be pretty stubborn. 
