Although Satan with his demons and evil spirits is, indeed, a great force of deceit to be reckoned with, he is too often seen as the cause of our sin (sometimes our own blame-shifting maneuver), but our flesh is often our own worst enemy.
Satan isn't the only one that is deceitful. Our own heart is deceitful; who can know it? And certainly the world's system is deceitful and beguiling, so we face deception from all vantage points.
Which is why we must be alert and gain wisdom and discernment of good and evil through the diligence of studying God's Word, with dependence on the Holy Spirit to teach us all things.
