By this ye know the Spirit of God: every spirit who confesseth that Jesus the Messiah is come in the flesh, is from God.

And every spirit who confesseth not that Jesus the Messiah is come into the world, is not from God: and this is that spirit of antichrist which ye have heard that it is coming, and now is already in the world.

But we know that the Son of God hath come, and hath given to us understanding, that we might know the true God; and we are in him that is true, in his Son Jesus the Messiah. HE is the true God, and the life eternal.