The Elect Lady
The apostle John's second epistle is addressed to "the elect lady and her children" - an analogy for the true Church (the "lady" - see the Fact Finder question below) and true Christians ("her children" - see People or Place?, also What Was Lost?). From the time of the New Testament, the people who correctly worship the True God (in contrast to those who have invented their own "Christianity," much to their eventual regret i.e. Matthew 7:21-23 - the reason that John also repeats the word "true" in his epistle) are generally referred to as "The Church of God" (e.g. Acts 20:28, 1 Corinthians 1:2), the literal meaning of "church" being a gathering of those called, from the Greek word pronounced ek-klay-see-ah (see Spiritual and Physical Gatherings). In the Old Testament, and in Prophecy, they were, and are, also known figuratively as "The daughter of Jerusalem" and "The daughter of Zion" - Jerusalem and Zion being symbolic, and literal, of God's future rule on earth (see also Who, What or Where Is Zion?).
"the elect lady and her children, whom I love in the truth"
John begins the epistle to "the elect lady and her children," a letter to a particular congregation, and ends it with a greeting from the congregation from which he was writing - "the children of thy elect sister greet thee."
"The elder unto the elect lady and her children, whom I love in the truth; and not I only, but also all they that have known the truth; For the truth's sake, which dwelleth in us, and shall be with us for ever."
"Grace be with you, mercy, and peace, from God the Father, and from the Lord Jesus Christ, the Son of the Father, in truth and love."
"I rejoiced greatly that I found of thy children walking in truth, as we have received a commandment from the Father. And now I beseech thee, lady, not as though I wrote a new commandment unto thee, but that which we had from the beginning, that we love one another. And this is love, that we walk after his Commandments [see The First Commandment, The Second Commandment, The Third Commandment, The Fourth Commandment, The Fifth Commandment, The Sixth Commandment, The Seventh Commandment, The Eighth Commandment, The Ninth Commandment and The Tenth Commandment]. This is the commandment, That, as ye have heard from the beginning, ye should walk in it."
"For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist [see Who Will Be The Antichrist?]. Look to yourselves, that we lose not those things which we have wrought, but that we receive a full reward. Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son. If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed: For he that biddeth him God speed is partaker of his evil deeds."
"Having many things to write unto you, I would not write with paper and ink: but I trust to come unto you, and speak face to face, that our joy may be full."
"The children of thy elect sister greet thee. Amen" (2 John 1:1-13 KJV)
Fact Finder: How did the "daughter of Zion" become the "elect lady"?
See Daughter of Zion