1 Timothy 6:3 -10 WARNINGS Some people find their way among God's people, and occasionally, by using subtlety, find their way into an assembly. Usually, it doesn't take too long to know what a person is really like, so there should be no undue haste to bring a person into the fellowship of the believers, even if they come with a letter from an unknown source. People who teach false doctrine usually want to argue their points based on their knowledge of theology or education. Their own point of view and their perspective on a doctrine are more important to them than that which we have received from our Lord Jesus Christ. Controversy about words and practices with which they do not agree becomes a big deal to them as they find fault with tried and proven practices of assemblies that have been a testimony for years in the place where the Lord has put His name.
Some want to make money from preaching and want a position of authority, and perhaps even superiority over others whom they believe are less capable of thinking than themselves. They may have the ability to articulate their opinions in a way that sounds right, to the extent that some may believe what they say. To argue with them is a waste of time and an exercise in futility. Just stay away from such controversies that disrupt the people and work of God. Actually, they are rejecting "the words of our Lord Jesus Christ" which is a rejection of Him personally. In their pride, they are challenging Him as the Source of all truth.
That which motivates people to do that is, first of all, envy. They want what another person or persons have. It may be prestige, popularity, or financial support. Strife also comes when there are contentions and contradictions of the kind that divide people. Reasonable dialogue is normal between believers, but those who want their opinions to be accepted or they become controversial should be avoided. They will often rail against those who will not accept their false doctrine, using malicious talk against others with the intent of condemning them. Evil surmising is a way of undermining trust in another person with an ulterior motive behind the words. "Perverse disputing of corrupt minds" creates constant friction and quarrels that lead to a divisive spirit among those who pay heed to such talk.
The false teachers had been in contact with the truth and know what it is, but want a pseudo-Christianity that pays attention to speculation, rhetoric, and verbal acuity based on higher education, perhaps rather than plain biblical interpretation that leaves no questions.