Everyone who believes that Jesus is the Christ has been born of God, and everyone who loves the parent loves the child. 2By this we know that we love the children of God, when we love God and obey his commandments. 3For the love of God is this, that we obey his commandments. And his commandments are not burdensome, 4for whatever is born of God conquers the world. And this is the victory that conquers the world, our faith. 5Who is it that conquers the world but the one who believes that Jesus is the Son of God? 6This is the one who came by water and blood, Jesus Christ, not with the water only but with the water and the blood. And the Spirit is the one that testifies, for the Spirit is the truth. 7There are three that testify: 8the Spirit and the water and the blood, and these three agree. 9If we receive human testimony, the testimony of God is greater; for this is the testimony of God that he has testified to his Son. 10Those who believe in the Son of God have the testimony in their hearts. Those who do not believe in God have made him a liar by not believing in the testimony that God has given concerning his Son. 11And this is the testimony: God gave us eternal life, and this life is in his Son. 12Whoever has the Son has life; whoever does not have the Son of God does not have life. (1 John 5:1-12, NRSV)
How do we know if we have the Son?
Because verse 12 clearly states that if you have the Son you have life, but if you do not have the Son you do not have life.
So how do you know if you have the Son?
If you keep the commandments?
And we all know that the law can not be kept, so therefore if that is the test then we all fail and none of us have the Son.
If you have the testimony that Jesus died for you by His blood has set you free, that lives in you and He is in you.
And in that, you are changed to love the world as He does. So if you love the world as if you created it, then you have the Son.
So do you love all of the world?