1John 3: 9 No one who is born of God will continue to sin, because God’s seed remains in him; he cannot go on sinning, because he has 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 a child of God; nor is anyone who does not love his brother. What does verse 9 means? Just for starters, the fact that verse 10 indicates that verse 9 is something visible, even measureable to the point of distinguishing children of God from children of the devil eliminates interpretations like this is referring to something merely internal to those born of God. Nor is it referring to perfect behavior, as 1John 2:1;1:8,10; not to mention Gal 5:17 all indicate those born of God will sin from time to time. What I find interesting about 1John is that in the Greek whenever John is referring to lifestyle he uses the present tense. And whenever John is referring to a snapshot event, or a behavior uncharacteristic of the person, he uses the aorist (which we don't have in English and so you lose something in the translation). In this case John is saying that sinning is uncharacteristic of those born of God, not denying that it doesn't occur uncharactertically from time to time. Those born of God don't live a lifestyle of sin. And this is a distinguishing mark of those born of God. Thus when Paul says, "Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God." 1Cor 6:9,10 it is not that salvation is contingent upon one's behavior, but rather that there simply doesn't exists any such person who lives a lifestyle of sin who has been born of God.