ἐνδύσασθε τὴν πανοπλίαν τοῦ θεοῦ πρὸς τὸ δύνασθαι ὑμᾶς στῆναι πρὸς τὰς μεθοδείας τοῦ διαβόλου· ὅτι οὐκ ἔστιν ἡμῖν ἡ πάλη πρὸς αἶμα καὶ σάρκα ἀλλὰ πρὸς τὰς ἀρχάς, πρὸς τὰς ἐξουσίας, πρὸς τοὺς κοσμοκράτορας τοῦ σκότους τούτου, πρὸς τὰ πνευματικὰ τῆς πονηρίας ἐν τοῖς ἐπουρανίοις. Put on the full armor of God for you to be able to stand to the methods of the devil; for our struggle is not to blood and flesh but to the rulers, to the authorities, to the world-rulers of this darkness, to the spirits of evil in the heavenly places.
Adding to the command to be strengthened, he instructs his readers and listeners to put on the full armor of God. Again, we see that God is the one who provided the strength and the equipment necessary for the task. However, Christians are expected to tap into those provisions. The purpose of putting on this armor is so that they will be able to stand against the deceitful schemes of the devil. Paul continues, saying that the struggle they have is not against blood and flesh (it is not with earthly, human things), but it is against rulers, authorities, world-rulers of this darkness, and the spiritual things of evil in the heavenly places (it is with heavenly, spiritual things).
Put on the full armor of God in order for you to be able to stand against the deceptive schemes of the devil; for our struggle is not against blood and flesh but against rulers, authorities, world-rulers of this darkness, and the spiritual things of evil in the heavenly places.
If God’s armor is not physical, but rather spiritual, then it must follow that such armor is designed to protect those who wear it from spiritual things. We need to emphasize that being a Christian involves spiritual struggles. Spiritually, we are constantly to be on guard. Spiritually, we are to stand firm. The spirit world is present and evident, and if we let our guard down, we can be taken. We must prepare ourselves not by our own strength and not with our own guard but with what God has provided for us. God has provided us with what we need in order to withstand the deceptive schemes of the devil. If we rely on God and utilize what he has equipped us with, we will do well. But on our own, if we rely merely on ourselves and try do it our own way, we will fail.