If we say we have no sin: This is the second false claim of the Gnostics (see 1:6). They trusted they could be free from sin because Christ had removed their sins forever. They believed that their special knowledge put them in a position where sin no longer mattered. But Christians do still sin when they live in their old nature (see Romans 7:14–25). A true Christian both acknowledges this sin and trusts Christ to take it away (1 John 1:9).