'Victory' in the Bible

I am writing to you, fathers,because you have come to knowthe One who is from the beginning.I am writing to you, young men,because you have had victory over the evil one.

I have written to you, children,because you have come to know the Father.I have written to you, fathers,because you have come to knowthe One who is from the beginning.I have written to you, young men,because you are strong,God’s word remains in you,and you have had victory over the evil one.

For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.

Who is he that gets the victory over the world, but he that believes that Jesus is the Son of God?