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"All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness [ 2 Timothy 3:16 ]" from video introduction.
Summary of The Book of 1st John
Author: 1, 2, and 3 John have from earliest times been attributed to the apostle John, who also wrote the Gospel of John. The content, style, and vocabulary seem to warrant the conclusion that these three epistles were addressed to the same readers as the Gospel of John.
Date of Writing: The Book of 1 John was likely written between A.D. 85-95.
Purpose of Writing: The Book of 1 John seems to be a summary that assumes the readers' knowledge of the gospel as written by John and offers certainty for their faith in Christ. The first epistle indicates that the readers were confronted with the error of gnosticism, which became a more serious problem in the second century. As a philosophy of religion it held that matter is evil and spirit is good. The solution to the tension between these two was knowledge, or gnosis, through which man rose from the mundane to the spiritual. In the gospel message, this led to two false theories concerning the person of Christ, Docetism—regarding the human Jesus as a ghost—and Cerinthianism—making Jesus a dual personality, at times human and at times divine. The key purpose of 1 John is to set boundaries on the content of faith and to give believers assurance of their salvation.
1 John 1:9, "If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness."
1 John 3:6, "No one who lives in him keeps on sinning. No one who continues to sin has either seen him or known him."
1 John 4:4, "You, dear children, are from God and have overcome them, because the one who is in you is greater than the one who is in the world."
1 John 5:13, "I write these things to you who believe in the name of the Son of God so that you may know that you have eternal life."
The key word is "knowledge," with its related words, occurring at least 13 times in the Book of 1 John.." from the article: Summary of The Book of 1st John