For whatever is born of God overcomes the world. And this is the victory that has overcome the world--our faith.
References for 1 John 5:4
Who is he who overcomes the world, but he who believes that Jesus is the Son of God?
This is He who came by water and blood--Jesus Christ; not only by water, but by water and blood. And it is the Spirit who bears witness, because the Spirit is truth.
For there are three that bear witness in heaven: the Father, the Word, and the Holy Spirit; and these three are one.
And there are three that bear witness on earth: the Spirit, the water, and the blood; and these three agree as one.
References for 1 John 5:8
If we receive the witness of men, the witness of God is greater; for this is the witness of God which He has testified of His Son.
References for 1 John 5:9
He who believes in the Son of God has the witness in himself; he who does not believe God has made Him a liar, because he has not believed the testimony that God has given of His Son.
And this is the testimony: that God has given us eternal life, and this life is in His Son.
He who has the Son has life; he who does not have the Son of God does not have life.
These things I have written to you who believe in the name of the Son of God, that you may know that you have eternal life, and that you may continue to believe in the name of the Son of God.
References for 1 John 5:13
Now this is the confidence that we have in Him, that if we ask anything according to His will, He hears us.