Yet when we stand in the law of the Spirit of Life in Christ Jesus, he cannot touch us, he can only touch dead flesh. But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you. For when ye were the servants of sin, ye were free from righteousness. But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life. The way Satan gets flesh activated is by temptation and yielding to temptation.
Temptation is satanic allurement.
Satan tries to persuade us to yield to the his information that is against the knowledge of Christ. He lies and mingles those lies with the truth. Truth by its intrinsic nature becomes impure when a lie is mingled in. You can take a glass of filthy water and add one drop of good water and there will be no change. Yet if you take a glass of good water and add one drop of filthy water it corrupts the whole glass.