JMNT(i)
16 And we have come by intimate experience to know and have believed, trusted and are convinced of the Love which God has (or: holds) continuously within (or: among) us. God exists continually being Love (God is Love), and the person continuously remaining (dwelling; abiding) within, and in union with, the Love, is continuously remaining (dwelling; abiding) within, and in union with, God – and God constantly dwells (remains; abides) within him and in union with him.
17 Within this the Love has been brought to its goal, been matured, reached its destiny and is now perfected with us, to the end that we may continuously have confident freedom of speech (the boldness of a citizen to speak publicly without fear of punishment) within the day of sifting and separation (distinction, evaluation and decision; judging; judicial proceeding; or: administering of justice), because just as That One is, we also continuously exist being: within the midst of this ordered System (or: because in this world of culture, religion, economy and government, even we, ourselves, progressively exist – correspondingly as, and to the according level as, That One continuously exists and is progressively being).
18 Fear does not exist within the Love, but rather perfect love (mature love; love having reached its goal) repeatedly (habitually; progressively) throws the fear outside, because the fear constantly has and holds a pruning (a curtailment; a checking; restraint; a lopping off – thus, a correction). But the one habitually fearing or dreading has not been perfected within the Love (has not been brought to the destined goal of maturity – in union with love).
19 We ourselves are [some MSS add: now] habitually loving (or, as a subjunctive: can and should be constantly loving) because He Himself first loved (or: urges to reunion with) us.