1 John 2:21 (KJV)

What does 1 John 2:21 mean?

1 John 2:21 means that the writer, John, is not writing because his readers are ignorant of the truth, but because they already know it, and because truth and lies are completely separate—no lie comes from the truth. John is reassuring his audience that they are already grounded in what is true, and he wants to remind them that truth and falsehood cannot mix.

John, one of Jesus’ closest followers, is writing to a group of Christians who were facing confusion from false teachers. He emphasizes that his readers already possess knowledge of the truth, using this as a foundation to warn them against deception. The verse highlights the clear distinction between truth and lies, setting up the importance of holding firmly to what they have already learned.

The Greek behind 1 John 2:21

• ἀλήθεια (alētheia, "truth"): This word refers to what is real and reliable. John’s use of it stresses that his readers are already familiar with the genuine message about Jesus, not just opinions or rumors.
• ψεῦδος (pseudos, "lie"): This word means a deliberate falsehood. John’s statement that "no lie is of the truth" underlines that truth and falsehood are totally incompatible—there is no overlap or blending between them.
• οἶδατε (oidate, "know"): This Greek verb often means a settled, confident knowledge. John is not questioning their understanding; he is affirming it, which gives his warning more weight.

Why 1 John 2:21 matters

• This verse clears up any idea that John’s readers were uninformed or lacking; instead, he affirms their grasp of the truth, encouraging confidence rather than doubt.
• The strong separation between truth and lies helps the reader see that even small distortions or false teachings cannot be part of the genuine Christian message.
• In the context of 1 John, this verse sets up the following warnings about antichrists and deceivers, making it clear that the community already has what they need to discern truth from error.