“Herein is our love made perfect, that we may have boldness in the day of judgment: because as he is, so are we in this world.”
King James Version (KJV)
4:17 Hereby - That is, by this communion with God. Is our love made perfect; that we may - That is, so that we shall have boldness in the day of judgment - When all the stout - hearted shall tremble. Because as he - Christ. Is - All love. So are we - Who are fathers in Christ, even in this world.
1Jo 4:17 Herein is our love made perfect. When love is perfected in us we will have no fear of the judgment day. Those who love God supremely will not be terrified at his presence. Because as he is, so are we. The great ground of boldness is that we are as Christ; purified like him, made sinless like him, filled with love like him and appear at judgment in his likeness. In this world. This transformation begins when we are converted, hence, "in this world".