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The rejection of moral codes is nothing new for Christianity, but instead has occurred since its foundation. Since the beginning there were people who would manipulate or simply ignore passages of Scripture in order to live in the way they desired.
St. John refers to a group known as the Autoproscoptae (‘offenders against themselves’). These people cut themselves off from communion with the Church and did away with priestly accountability. Though they kept doctrines, they did not live appropriately, leading John to summarize them as such:
“Thus, they openly cohabit with women and maintain them privately in their homes. They are addicted to business and profit-making and other worldly affairs. They live unreasonably and neglect in deed those things which in word they profess to maintain, so that by the judgment of the Apostle they are transgressors. For, although they are monks and organized under a clergy, they honor God in word but in deed dishonor Him.”
Under moral heresies, we see that the first type of moral heresy is the type that claims one thing, but then does another. We can think of the multitude of fallen pastors who would rail against homosexuality while the entire time engaging in homosexuality. We can think of Christians who talk about how Christ came into the world to save the world, but then use their money and time to better themselves rather than helping others.
We think of Christians who go and worship Christ on Sunday, but their bank accounts and time spent helping others don’t reflect that they’re disciples. We think of Christians who rail against other Christians, but then do the very same things they rail against. This is a heresy that is not limited to a conservative or liberal Christian, but rather infects all Christians and is the most common heresy in existence.