Love and hatred for fellow believers

³ We know that we have come to know him if we keep his commands. ⁴ Whoever says, ‘I know him,’ but does not do what he commands is a liar, and the truth is not in that person. ⁵ But if anyone obeys his word, love for God is truly made complete in them. This is how we know we are in him: ⁶ whoever claims to live in him must live as Jesus did.

⁷ Dear friends, I am not writing you a new command but an old one, which you have had since the beginning. This old command is the message you have heard. ⁸ Yet I am writing you a new command; its truth is seen in him and in you, because the darkness is passing and the true light is already shining.

⁹ Anyone who claims to be in the light but hates a brother or sister is still in the darkness. ¹⁰ Anyone who loves their brother and sister lives in the light, and there is nothing in them to make them stumble. ¹¹ But anyone who hates a brother or sister is in the darkness and walks around in the darkness. They do not know where they are going, because the darkness has blinded them.

Reasons for writing

¹² I am writing to you, dear children,
    because your sins have been forgiven on account of his name.
¹³ I am writing to you, fathers,
    because you know him who is from the beginning.
I am writing to you, young men,
    because you have overcome the evil one.

¹⁴ I write to you, dear children,
    because you know the Father.
I write to you, fathers,
    because you know him who is from the beginning.
I write to you, young men,
    because you are strong,
    and the word of God lives in you,
    and you have overcome the evil one.