The readers’ assurance had been shaken by these denials and claims, so John writes to bolster their assurance by counteracting the false teaching of the false teachers. They had been shaken by antichrists who denied important elements of the message the readers had embraced at the beginning. In v 13, we have the assurance of salvation. And then about the confidence believers have "in the presence of God." We also learn from verse 21 that idols are not always pagan deities or images made of stone or wood.
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