He was a murderer from the beginning, not holding to the truth, for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies. - John 8:44
We have to remember that Satan is the father of lies. He is a murderer from the beginning and dwells in falsehood. He never wants the glory to go to Jesus Christ but rather twists the truth and deceives those in the Lord’s work to take glory to themselves. Satan is also the master counterfeiter who has been deceiving God’s people since the beginning. He spoke to Eve and deceived her by twisting the truth of God saying, “Has God indeed said?” Such twisting of the truth is his normal activity. Since the earliest days of the apostles, even with our Lord himself, there were deceivers and false brethren present: those who secretly come into God’s flock for personal gain and to infiltrate the liberty of the believers, betrayers, deceivers, false brethren, false prophets, and those desiring preeminence among the saints (3 John 1:9). Diotrephes and one's like him did not seek honour in the church as much as sought his own truth, his own way and seperated himself from the doctrines of the Apostles and all the other Churches. He was stubborn to think he was right and all others were wrong. A false teacher is always who is in admidst but then seeks to draw people "out of" towards themselves. Just like satan, these false teachers do not have, "the truth in them."
One key to understand the working of God versus Satan in a meeting of believers is the emphasis put on the Son of God. Those that worship, honor, and glorify the Holy Spirit more than Jesus Christ are not led by the Holy Spirit to do that. The Holy Spirit will always honor Jesus Christ; thus the true working of the Spirit can be distinguished in measure. The Scripture states: “He shall not speak of himself” (John 16:13). All early Church creed statements always elevate the work of the cross and the incarnation of the Son of God. In the end times, there will be an influx of those in the Church teaching doctrines of demons to deceive even the elect of God. There will be many false teachers who claim to be of the truth but are not. The most dangerous weapon against the Church is not persecution, but deception. One key feature of these deceptions is that there is something new offered, when rather we should be seeking to believe the truth that is old and that which the Church has held to from the beginning.