'Evil' in the Bible

I am writing to you, fathers, because you have known the [One who is] from the beginning. I am writing to you, young men, because you have conquered the evil one.

I have written to you, children, because you have known the Father. I have written to you, fathers, because you have known the [One who is] from the beginning. I have written to you, young men, because you are strong, and the word of God resides in you, and you have conquered the evil one.

not as Cain, who was of the evil one and violently murdered his brother. And {for what reason} did he violently murder him? Because his deeds were evil and the [deeds] of his brother [were] righteous.

We know that everyone who is fathered by God does not sin, but the one fathered by God, he protects him, and the evil one does not touch him.

We know that we are from God, and the whole world lies in [the power of] the evil one.