The devil would rather that his own counsel be enforced in the earth realm than have God's counsel established instead.
Our struggle with sin is basically a manifestation of the war going on between the forces of good and evil in the spirit realm where the human mind is the battle ground and consequently the medium of expression in the earth realm.
Spirit beings cannot operate on the earth without a human body and as such there is constant contention for the body of man. Your body is the divine license you have to function on earth. Without it, you cannot operate.
And so Apostle Paul says, if you want to live a victorious life and dominion over sin, you will need to take full possession and control of your mind.
"I thank God through Jesus Christ our Lord. So then with the mind i myself serve the law of God; but with the flesh the law of sin".
What he is saying here is this, every time your focus is the flesh you serve the law of sin. When your mind is preoccupied with carnal things you become a salve to sin: you become helpless so much that even when you desire to do good, as long as you focus on the flesh, sin dominates and overpowers you.
How then do you engage your mind to serve the law of God for victory over sin then? By casting down evil imaginations and every high thing that exalts itself against the knowledge of God.
Occupy your mind with the knowledge of the Word of God and through obedience to God and his word, and bring every contrary imagination into the captivity.
2 Cor 10:3-6.