Warning against antichrist

1 John 2:18-27
Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour.
They went out from us, but they did not really belong to us.
But you have an anointing from the Holy One, and all of you know the truth.
It is whoever denies that Jesus is the Christ. Such a person is the antichrist—denying the Father and the Son. No one who denies the Son has the Father; whoever acknowledges the Son has the Father also.
 As for you, the anointing you received from him remains in you, and you do not need anyone to teach you.
The early Christians were taught that an arch-enemy of Christ - the embodiment(實施例) of evil - would come on the scene when the Lord's return was imminent (即將來臨).
18: the actual word 'antichrist' occurs only in John's letters, but 2 Thessalonians 2 makes the same point. John sees many Antichrists already on the scene (false teachers, once within the church, who deny that the man Jesus was the Messiah and Son of God).
These early manifestations(表現) of the Great Evil are a sign that the time is near.
John comforts his readers that they are different. They know the truth. They have God's Holy Spirit to teach them. If they stay with the message they have heard, they will stay with the Son and the Father which means eternal life.
Why?
John was worry his reader didn't know how to identify the false teacher, and what they are belong.
The kernel of our believe is the Son of God, Jesus Christ and his resurrection and the God. 
Holy Spirit is within me, so we don't need others to teach us the truth. Holy Spirit will teach us what is the truth.
How?
Stand firm in what I have received from the Lord and Jesus Christ. the time is near there are many antichrist coming. Be aware of those evil things.