3:20 us, (k-6) Subjunctive. 'That,' ver. 20, refers to 'hereby' in ver. 19. It is showing what tests 'in truth.' The repetition of 'that' is nothing uncommon. It is found in Ephesians 2:11 ,Ephesians 2:12 . What 'hereby' refers to very commonly follows in John, as in vers. 16,24, and ch. 4.17, and elsewhere, frequently indeed with 'that.' 'God being greater' is evidently a testing, searching thing.

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