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.

More on Love and Hatred

11 For this is the message you heard from the beginning: We should love one another.
12 Do not be like Cain, who belonged to the evil one and murdered his brother. And why did he murder him? Because his own actions were evil and his brother’s were righteous.
13 Do not be surprised, my brothers and sisters,a if the world hates you.
14 We know that we have passed from death to life, because we love each other. Anyone who does not love remains in death.
15 Anyone who hates a brother or sister is a murderer, and you know that no murderer has eternal life residing in him.