I do not believe that Ha'Satan or his associates has any internal power over the faithfully righteous.
I agree, making three clarifications:
1. We are certainly likely to have minds that are not fully renewed, and may well continue to labor under old desires, dragging us into sin.
...each person is tempted when he is dragged away by his own evil desire and enticed.
-- James 1
2. While the Adversary has no internal power over us (that is, power within our minds), he and his associates still have billions of hours of experience with human nature, and they know our own personal histories and that of our ancestors.
3. While the Adversary has no internal power over us (that is, power within our minds), he and his associates can still affect our physical bodies and he can still arrange the physical circumstances around us.
Those two advantages of the Adversary place us against him in the position of a novice chess player opposing a Grand Master.
I'm a pretty rudimentary chess player...really, I only know the moves of the pieces--no real knowledge of strategy to speak of. Once I was playing a quite advanced player.
After the third move, he announced, "I will checkmate you in eight moves."
Well, I already knew I was hardly a match for him, and that a checkmate was surely in my future. But how could he predict my demise in eight moves?
Well, he was absolutely correct. In exactly eight moves, he announced "checkmate" and that was it.
That was because he knew the game so well. He knew the ways most people commonly move, he knew the strategies such that he had no problem
pushing me exactly the way he wanted me to go--without me even realize I was being pushed.
No, he did not have to enter my mind--he only had to herd me into his trap.
The advantage we have over the Adversary is the counsel of the Holy Spirit. When we operate in the Holy Spirit--and only then--can we make a move that the Adversary does not see coming.