1 John 2:21

I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.

1 John 2:21 (KJV)

Context

The First Epistle of John, written by the apostle John, addresses the assurance of salvation, love for one another, and the importance of truth. In this verse, John explains why he writes to his readers: not because they are ignorant, but because they already know the truth. The immediate context shows that believers have an anointing from the Holy One and know all things (1 John 2:20).

Meaning

John begins by affirming that he is not writing because his readers lack knowledge of the truth. They are already familiar with the Gospel and the teachings of Jesus Christ. His purpose is to reinforce and deepen their understanding, reminding them of the significance of what they already believe. The verse concludes with a stark contrast: “no lie is of the truth.” Falsehood is fundamentally incompatible with the nature of truth. John alerts his audience to the danger of deception, urging them to discern and cling to the genuine teachings of Christ.

Biblical connections

The lie John warns against is specifically the denial that Jesus is the Christ, as the following verse makes clear. This connection shows that the truth believers know is not abstract but centers on the person and work of Jesus. John writes to those who know this truth, not to the ignorant, affirming their understanding while providing necessary warning against false teachers who would lead them astray.

Application

Believers today can take comfort that their knowledge of the truth is real and sufficient. Yet this verse also calls for vigilance: because no lie comes from the truth, every teaching that contradicts the identity of Jesus must be rejected. John’s words encourage Christians to hold firmly to the truth they have received, growing in discernment and standing firm against deception.

Reflection

John writes not to scold but to confirm. His confidence in his readers’ knowledge of the truth is a model for how believers should encourage one another. The verse invites each Christian to examine what they know about Christ and to let that truth shape their lives, rejecting every lie that would diminish His glory.