How then does the Blood operate against Satan? It does so by putting God on the side of man against him. The Fall brought about a state of affairs in man which gave Satan a footing within him, with the result that God was compelled to withdraw himself. Man is now outside the Garden—beyond reach of the glory of God (Rom. 3.23)—because he is inwardly estranged from God. Because of what man has done, there is that in him now which, until it is removed, renders God morally unable to defend him. But the Blood removes that barrier, and restores man to God and God to man. Man is in favor now, and because God is on his side he can face Satan without fear.
You remember that verse in John’s first Epistle—and this is the translation of it I like best: “The blood of Jesus his Son cleanses us from every sin.”∗ It is not exactly “all sin” in the general sense, but every sin, every item. What does it mean? Oh, it is a marvelous thing! God is in the light, and as we walk in the light with Him everything is exposed and open to that light, so that God can see it all —and yet the Blood is able to cleanse from every sin. What a cleansing! It is not that I have not a profound knowledge of myself, nor that God has not a perfect knowledge of me. It is not that I try to hide something, nor that God tries to overlook something. No, it is that He is in the light and I too am in the light, and that there the precious Blood cleanses me from every sin. The Blood is enough for that! . . .
∗1 John 1-7: Marginal reading of New Translation by J. N. Darby.
Since God, seeing all our sins in the light, can forgive them on the basis of the Blood, what ground of accusation has Satan? Satan may accuse us before Him, but, “If God is for us, who is against us?” (Rom. 8.31) God points him to the Blood of His dear Son. It is the sufficient answer against which Satan has no appeal. “Who shall lay anything to the charge of God’s elect? It is God that justifieth; who is he that shall condemn? It is Christ Jesus that died, yea rather, that was raised from the dead, who is at the right hand of God, who also maketh intercession for us” (Rom. 8:33-34). Thus God answers his every challenge.
So here again our need is to recognize the absolute sufficiency of the precious Blood. “Christ having come a high priest . . . through his own blood, entered in once for all into the holy place, having obtained eternal redemption” (Heb. 9.11-12). He was Redeemer once. He has been High Priest and Advocate for nearly two thousand years. He stands there in the presence of God, and “he is the propitiation for our sins” (1 John 2.1-2). Note the words of Hebrew 9.14: “How much more shall the blood of Christ . . . cleanse your conscience.” They underline the sufficiency of His ministry. It is enough for God.