[Since] you have purified your souls by [your] obedience to the truth [i.e., the Gospel message], which produces a genuine love for your brothers, [now] you should have this kind of fervent, heartfelt love for one another.
And this is His commandment: We should believe in the name of His Son Jesus Christ [i.e., the person of Christ], and love one another, just as He has commanded us to do.
And this is the [greatest] commandment [See Matt. 2:37-38] we have received from Him: [It requires] that the person who [claims to] love God should also love his brother.
However, you are doing well if you fulfill [i.e., obey] the royal law found in the Scriptures [Lev. 19:18], “You should love your neighbor the same way that you love yourself.”
And now I ask you, lady [See verse 1], not as though writing a new commandment to you, but [I wanted to remind you of] one that we had [heard] from the beginning [of Christ’s ministry]: [It is] that we should love one another.
So then, we should do the right thing toward every person whenever we have the opportunity, and especially toward people who are part of God’s family [i.e., those making up “the faith”].
We ought to thank God for you always, brothers, since it is proper, because your faith is growing so much and the love that every one of you has for each other is increasing more and more.
For in [our relationship with] Christ neither the practice of circumcision nor refraining from its practice matters in any way; but [all that really matters is having a genuine] faith [in Christ] that causes us to work [for Him] out of a genuine love [for Him and others].
[I pray] that all of them may be one, just as you, Father, are [one] in [fellowship with] me, and I [am one] in [fellowship with] you, so that they also may be [one] in [fellowship with] us in order that the world may [see it and] believe that you sent me.
If you love your neighbor, you will not do anything wrong to him. So, to love people is the way to fulfill [the requirements of] the law [See Matt. 22:39].