One way to help identify lies is to find a verse that moves me to tears of longing, a verse that I feel resistant to believe because it is too good to be true. Then to work backward to see what the lie is. I used this method to identify the first lie. There is a passage that has moved me to tears ever since as a child I first heard it in a solo from Handel's Messiah.
Lie: God forgave my past sins, but in the future I will commit a sin that will place me outside the provisions of the New Covenant.
Truth: Jesus Himself is guarding the door of the New Covenant to guarantee that I do not walk outside the boundary of its provisions.
Scripture: "What then shall we say to these things? If God is for us, who can be against us? He who did not spare his own Son but gave him up for us all, how will he not also with him graciously give us all things? Who shall bring any charge against God's elect? It is God who justifies. Who is to condemn? Christ Jesus is the one who died—more than that, who was raised—who is at the right hand of God, who indeed is interceding for us." (Romans 8:31-34)
Explanation: I live in terror of disqualifying myself. This fear make me passive by this reasoning: Since I am destined to commit an unpardonable sin, there is no reason to expend any effort to build my relationship with God. Another point of angst is that I am a Calvinist: The presence of this fear shames me since my emotions contradict the doctrines to which my mind assents.