Herein ( ἐν τούτῳ )
To what does this refer? Two explanations are given. (1.) To the following that we may have boldness. So Huther, who argues thus on the ground that 1 John 4:18shows that the drift of the writer's thought is toward the fearlessness of love. According to this, therefore, love has its fulfillment in freeing us from fear, and inspiring us with boldness even in view of the final judgment. (2.) To what precedes, viz., our dwelling in God and He in us. So Westcott: “The fellowship of God with man and of man with God, carries with it the consummation of love.” I prefer the latter, principally on the ground that in such phrases as ἐν τούτῳ inthis, διὰ τοῦτο onthis account, therefore, the pronoun usually refers to something preceding, though more fully developed in what follows. See John 5:16, John 5:18; John 6:65; John 8:47; John 10:17; John 12:18; John 16:15.
Our love ( ἡ ἀγάπη μεθ ' ἡμῶν )
The A.V. construes μεθ ' ἡμῶν withus, with love, making with us equivalent to our. In that case it might mean either the love which is between Christians, or the love which is between God and Christians. The Rev. construes with us with the verb: love is made perfect with us. The latter is preferable. I do not think it would be easy to point out a parallel in the New Testament to the expression ἀγάπη μεθ ' love that with us = our love. The true idea is that love is perfected in fellowship. The love of God is perfected with us, in communion with us, through our abiding in Him and He in us. “Love is not simply perfected in man, but in fulfilling this issue God works with man” (Westcott). Compare 2 John 1:3, “grace shall be with us ” (true reading); and Acts 25:4, “what things God had done with them.” See also Matthew 1:23; 1 Corinthians 16:24; Galatians 6:18. Μετά withis used constantly in the New Testament of ethical relations. See Matthew 20:2; Matthew 2:3; Luke 23:12; Acts 7:9; Romans 12:15; 1 John 1:6.
Boldness ( παῤῥησίαν )
See on 1 John 2:28.
The day of judgment ( τῇ ἡμέρᾳ τῆς κρίσεως )
Lit., the day of judgment. The exact phrase occurs here only. Ἡμέρᾳ κρίσεως dayof judgment, without the articles, is found Matthew 10:15; Matthew 11:22, Matthew 11:24; Matthew 12:36; 2 Peter 2:9; 2 Peter 3:7. The day is called the great day of their wrath (Revelation 6:17); the day of wrath and of revelation of the righteous judgement of God (Romans 2:5); the day of visitation (1 Peter 2:12); the last day (John 6:39, John 6:40, John 6:44, John 6:54); that day (Matthew 7:22; Luke 6:23; Luke 10:12). The judgment is found Matthew 12:41, Matthew 12:42; Luke 10:14; Luke 11:31, Luke 11:32.
Likeness to Christ is the ground of boldness.
As ( καθὼς )
Not absolutely, but according to our measure, as men in this world.
The present tense is very significant. Compare 1 John 3:7, “is righteous even as He is righteous.” The essence of out being as He is lies in perfected love; and Christ is eternally love. “He that abideth in love abideth in God and God in him.” Compare 1 John 3:2.
In this world
This present economy, physical and moral. The phrase limits the conception of likeness.