1 John 3:3

In the meantime we anticipate seeing and knowing Jesus Christ fully, and that anticipation has a purifying effect on us now (cf. 1 John 2:1; 1 John 2:6; 1 John 2:29; 1 John 3:7; 1 John 3:16; 1 John 4:17; Matthew 5:8). [Note: See Wayne A. Brindle, "Biblical Evidence for the Imminence of the Rapture," Bibliotheca Sacra 158:630 (April-June 2001):149-50.] Similarly in the future seeing and knowing Christ will have a completely purifying effect on us (cf. 2 Corinthians 3:18). The believer’s hope is not "in him" (AV and NIV; i.e., "within himself"), but "on Him" (NASB; i.e., "set on Christ"; Gr. ep auto).

"John states two reasons why the Christian ought to be pure. One is related to a past work of God and the second to a future work." [Note: Ryrie, "The First . . .," p. 1472.]