When you overcome the flesh, then Satan stands on the outside looking in. He can’t just get anything going against you once you’ve crucified it.
Jesus said the prince of this world cometh but he doesn’t have anything in me. (Paraphrasing); Jesus said that the ruler of this world does not control my world.
Jesus, before his public ministry began; had to overcome the temptations of the flesh in the wilderness. And he did. How do we overcome and go through this process? It’s through relationship and with a working operational knowledge of the Word.
1 Cor. 9:26,27
26 I therefore so run, not as uncertainly; so fight I, not as one that beateth the air:
27 But I keep under my body ( the flesh), and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway.