Haven't found many Christians aware of this one. Does your Priest/Minister tell you that in order to be happy, you need to surround yourself with good; to eliminate everything negative? Don't talk about negative things?
The sin of being silent.
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Ezekiel 3:18-19 If I say to the wicked, “You shall surely die,” and you give him no warning, nor speak to warn the wicked from his wicked way, in order to save his life, that wicked person shall die for his iniquity, but his blood I will require at your hand. But if you warn the wicked, and he does not turn from his wickedness, or from his wicked way, he shall die for his iniquity, but you will have delivered your soul.