I John 2:1 My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous. 2 He is the propitiation for our sins, and not for ours only but also for the sins of the whole world. 3 And by this we know that we have come to know him, if we keep his commandments. 4 Whoever says “I know him” but does not keep his commandments is a liar, and the truth is not in him, 5 but whoever keeps his word, in him truly the love of God is perfected. By this we may know that we are in him: 6 whoever says he abides in him ought to walk in the same way in which he walked.
– Jesus Christ, the righteous, is God’s satisfaction [propitiation] of His wrath against our sin
– By this one truth we are assured we have come to know the Father.
– By this simple assurance we may also know that we are “in Jesus.”
– When we are “in Him” the love of God is perfected “in us.”