'Little Children' in the Bible

I am writing to you, little children, because you sins are forgiven you for his name's sake.

I am writing to you, fathers, because you have come to know him who is from the beginning. I am writing to you, young men, because you have fully overcome the Evil One. I have written to you, little children, because you have learned to know the father.

My little children, you are of God and have conquered them; because he that is within you is greater than he that is in the world.

My little children, guard yourselves from idols.