“when he (Christ) is revealed we will be like him (Christ)”. The second interpretation is the more likely. 3:3. “Purifies himself”: Christian hope, which is grounded on Christ, is something active and it moves the Christian to “purify himself”. This verb is evocative of the ritual purifications required of priests in the Old Testament prior to engaging in divine service (cf. Ex 19:10; Num 8:21; Acts 21:24); here, and in other places in the New Testament, it means interior