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1 John 3:4

4 Everyone who sins breaks the law; in fact, sin is lawlessness. 5 But you know that he appeared so that he might take away our sins. And in him is no sin. 6 No one who lives in him keeps on sinning. No one who continues to sin has either seen him or known him

7 Dear children, do not let anyone lead you astray. The one who does what is right is righteous, just as he is righteous. 8 The one who does what is sinful is of the devil, because the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the devil’s work. 9 No one who is born of God will continue to sin, because God’s seed remains in them; they cannot go on sinning, because they have been born of God. 10 This is how we know who the children of God are and who the children of the devil are: Anyone who does not do what is right is not God’s child, nor is anyone who does not love their brother and sister.

Calvinists use this to plumb the depths of despair as since they do not believe in repentence, then anyone who does not do what is right the Calvinist believe they were never really Christian since they would fail the P 'Perseverance'.

They will never understand 1 Corinthians 6:9-10

9 Or do you not know that wrongdoers will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor men who have sex with men[a] 10 nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God

and Galatians 5:19-21

19 The acts of the flesh are obvious: sexual immorality, impurity and debauchery; 20 idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions 21 and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.

The Calvinist will say anyone who did this was never really Christian at all -- in the Calvinist scheme, there is no repentence, no forgiveness, no loving, forgiving God

and yet they do not read Romans 11:20-24

20 Granted. But they were broken off because of unbelief, and you stand by faith. Do not be arrogant, but tremble.

21 For if God did not spare the natural branches, he will not spare you either.

22 Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in his kindness. Otherwise, you also will be cut off.

23 And if they do not persist in unbelief, they will be grafted in, for God is able to graft them in again.

24 After all, if you were cut out of an olive tree that is wild by nature, and contrary to nature were grafted into a cultivated olive tree, how much more readily will these, the natural branches, be grafted into their own olive tree

For further discussion see Robert Shank, Life in the Son (Minneapolis: Bethany House, 1989) and Dale Moody, The Word of Truth (Grand Rapids: Eerdmans, 1981), 348ff. Both authors are Baptists who believe in conditional security, not eternal security.