Summary: Fear has been used to destroy and cripple the effectiveness of many believers but God is able to deliver you from all fears.
2 Corinthians 2:10-11 KJV 10 To whom ye forgive any thing, I forgive also: for if I forgave any thing, to whom I forgave it, for your sakes forgave I it in the person of Christ; 11 Lest Satan should get an advantage of us: for we are not ignorant of his devices.
Romans 8:1-17 KJV There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit. 2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death. 3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: 4 That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit. 5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit. 6 For to be carnally minded is death; but to be spiritually minded is life and peace. 7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be. 8 So then they that are in the flesh cannot please God. 9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. 10 And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness. 11 But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you. 12 Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. 13 For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live. 14 For as many as are led by the Spirit of God, they are the sons of God. 15 For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father. 16 The Spirit itself beareth witness with our spirit, that we are the children of God: 17 And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together.
2 Timothy 1:7 KJV For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.
1 John 4:17-18 KJV Herein is our love made perfect, that we may have boldness in the day of judgment: because as he is, so are we in this world. 18 There is no fear in love; but perfect love casteth out fear: because fear hath torment. He that feareth is not made perfect in love.
Hebrews 2:14-15 KJV Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil; 15 And deliver them who through fear of death were all their lifetime subject to bondage.
SO far we have looked at discouragement, confusion and deception. We have by no means exhausted the subjects but merely touched on it. If the devil finds that he can defeat you with a single weapon every time then he will certainly continue to use it or variations of it since you constantly allow yourself to be entrapped there in.
The end result of all this is to blind your minds to the truth of God's word, to deflect you from becoming effective in God's service, to prevent you from realizing victory in your life.
He will play you against each other. He will probe until he finds your weak spot and will apply pressure until you cave in. Do NOT trust him, not for a second, not for a fraction of a second, not for ANY amount of time. He will try to make you ineffective. He will try to split you up and pit you against each other. He can play you like a musical instrument if you are unaware and the music he produces from you will not be for God's glory. Be sober, be vigilant, be on guard, be aware, be watchful, be prepared.