One of the things I see with some of the offshoots of twi are listed here by Jesus. Pride will make a person do some pretty hurtful things to people. It'll make them think they're right, when they're dead wrong. It'll make them hold on to things when they should let them go. They'll teach things for doctrine they shouldn't. Sadly it goes on.
Mark 7:15 "There is nothing that enters a man from outside which can defile him; but the things which come out of him, those are the things that defile a man.
16 "If anyone has ears to hear, let him hear!"[fn]
17 When He had entered a house away from the crowd, His disciples asked Him concerning the parable.
18 So He said to them, "Are you thus without understanding also? Do you not perceive that whatever enters a man from outside cannot defile him,
19 "because it does not enter his heart but his stomach, and is eliminated, thus purifying all foods?"[fn]
20 And He said, "What comes out of a man, that defiles a man.
21 "For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
22 "thefts, covetousness, wickedness, deceit, lewdness, an evil eye, blasphemy, pride, foolishness.
23 "All these evil things come from within and defile a man."