With respect, Jobeluan, The question is about heresy, not the ongoing struggle with sin that we all share.

Especially when it comes to teachers and those who minister to the church in His name, it is vital that they be faithful to the written word of God, rightly divided. They can do an awful lot of damage if they teach false doctrine. How much patience should false teachers be shown? (HINT: How much patience did Jesus have with the scribes and pharisees, or Paul with the Gnostics and Judaizers?)