But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them—bringing swift destruction on themselves. 2 Peter 2:1
Two thousand years has passed since this was written, but it could have been written yesterday. As long as greed and power exist, so will false teachings. But these teachings ultimately come from the father of lies himself because he wants to confuse and interrupt the body of Christ from carrying out its mission. False teachers prey upon the greed, power, and pride of those in the pews. Does someone set out to be a false teacher? Normally, no. But when people begin to hang on their every word, they need to introduce newer doctrines that will continue to entice and draw people. The doctrinal errors are small at first and may even be incidental. But once these teachers gather the following, they themselves get puffed up in pride and build upon their original teachings.
These false teachers exist because they have a willing and eager audience who, as the Bible says, have itching ears. In other words, they want to believe something more and have an edge over the average Christian. The false teachers are more than willing to provide that edge.
Be on your guard against those who come into the church and introduce pseudo-intellectual doctrines that sounds plausible until you examine them thoroughly. As the day of His return approaches, these false teachers will increase.