John 8:44 AMP
You are of your father, the devil, and it is your will to practice the lusts and gratify the desires [which are characteristic] of your father. He was a murderer from the beginning and does not stand in the truth, because there is no truth in him. When he speaks a falsehood, he speaks what is natural to him, for he is a liar [himself] and the father of lies and of all that is false.
Now in this verse first Jesus is clearly not speaking to believers. I am using this verse to tell you that fear comes from the enemy and our flesh. But the fear coming from our flesh as believers would not be scary at all if it was not “amplified” by the devil. Once you truly believe the truth from the Word he will stop or almost stop feeding you lies because he knows you will not believe them because you will be secure in the truth of the Word of God. But before that he will try his best. He will tell you things like you are so sinful, you know you are not worthy of God’s love when the Word states clearly that God is love and that there is no condemnation for those who are in Christ and are called according to His purposes. He will tell you that you are weak and not able to be faithful to God when the Word states that it is in our weakness that Jesus acts the strongest in us and through Christ nothing is impossible and that God never has and never will give you a circumstance that demands more strenght that is common to men and that His joy is your strenght and i can go on and on about all the help God Has available to you and His to you! The best way to start recognize the lies of the enemy is every time you get a negative thought about yourself and your relationship with God get your Bible and start digging for the truth that will come in direct opposition to the negative thought. Write the Word on a paper if it can help. I would suggest a Bible application to download in your iPhone or tablet like Youversion that you can get in Google Play that has many versions if the Bible to choose from and were you can make searches fast. It might seem laborious for you to compare each lie with the Bible but in reality it’s not and at the same time you get to know God way better and get closer to Him. When you will be able to detect the lie right away you will also start to enter the rest of God: perfect peace of mind. The rest of God is also knowing who you are in Christ without a doubt. That makes a confident, secure believer. Who would not want that?