Recognize the spirit of truth

1 John 4:1-6
To dear friends:
How to recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God.
To children
Because the one who is in you is greater than the one who is in the world.
We are from God, and whoever knows God listens to us; but whoever is not from God does not listen to us. This is how we recognize the spirit of truth and the spirit of falsehood.
John sets one basic test by which to judge any teacher - he must recognize that Jesus Christ came as a human being. He is not ignoring the equally essential recognition of Jesus as Son of God. But it was Jesus 'humanity that the heretics(異端) of John's day denied.
So they cannot possibly come with a message from God. Because we belong to God, John says, we can tell truth from error.
Why?
There are many false spirits came from the world, so when we acknowledge the truth, then we can know the false spirit.
Obey the word of God and believe Jesus Christ has come in the flesh is from God. So flesh is not evil but live out the honor of God in me.
How?
Live out the image of God in the world to honor his Holy name.