Then I heard a loud voice saying in Heaven, "Now salvation, and strength, and the kingdom of our God, and the power of His Christ have come, for the accuser of our brethren, who accused them before our God day and night, has been cast down." Revelation 12:10
Satan was cast down and cursed by God in the garden, no longer able to defeat us, accusation, fear, doubt, and unbelief are his only weapons against us. Even though his power was stripped from him he has managed to deceive mankind for eons by his accusations and lies!
Jesus told His disciples that we have all power and authority over the powers of darkness, and nothing shall harm us. Even though the devil is a defeated foe he uses deceit, deception, and lies to gain an advantage over us if we let him. In the garden he used his famous line, "Has God said?" Making Adam and Eve doubt the command of God and eat of the tree they were forbidden to eat of.
Pride and arrogance fuel his resolve to defeat us, even the Son of God was a target in the wilderness. Baptized by John, filled with the Holy Spirit, and told by His heavenly Father, "You are my beloved Son, in You I am well pleased!" Jesus then spent 40 days in the wilderness and when they ended, He was hungry, and Satan pulled out his most successful scheme, doubt, "If You are the Son of God tell this stone to become bread!"
Be sober, (self-controlled) be vigilant, (watchful) because your adversary the devil walks about like a roaring lion, seeking whom he may devour. I Peter 5:8
Your servant in Christ, Timothy Laughlin
Minister of the Gospel of Jesus Christ