Sometimes living for the Lord is a real battle and a real fight. But the Devil can't lay a claw or a fang on you, he can't inundate you or drown you with his lies if you resist him with the Word of God! The Bible is God's standard, like a banner or flag that we can wave in front of the Devil's sharp pointed nose, and he will flee!--He can't take the Word! (Jam.4:7)
When the Devil tempts you, what's the first thing to do?--Ask the Lord for a Scriptural answer! That's what Jesus did! When the Devil tempted Him and lied to Him, He just quoted the Scriptures! Of course, the Devil also tried quoting Scripture to Jesus, but he twisted them and took them out of context. So the Lord just fired Scriptures back at him the way they should have been applied, "It is written!" (Lk.4:1-13)--And the Devil fled! He can't resist the Word!
The best way to stop an attack is to counter-attack! The best defense is an offense! Wage a militant warfare against the Enemy! Baptise yourself constantly in prayer, soak yourself in the Word, memorise and quote God's Promises!--Even to the Devil, as well as to yourself! You can put the Enemy out of action with the Word!--Bury him in a flood of the Truth!