False spiritual teachers were a big problem in the early church. Because there was not a complete New Testament that believers could refer to, many churches fell prey to pretenders who taught their own ideas and advanced themselves as leaders. John wrote this letter to set the record straight on some important issues, particularly concerning the identity of Jesus Christ.
Because John’s letter was about the basics of faith in Christ, it helped his readers reflect honestly on their faith. It helped them answer the question, Are we true believers? John told them that they could tell by looking at their actions. If they loved one another, that was evidence of God’s presence in their lives. But if they bickered and fought all the time or were selfish and did not look out for one another, they were betraying that they, in fact, did not know God.
That did not mean they had to be perfect. In fact, John also recognized that believing involved admitting our sins and seeking God’s forgiveness. Depending on God for cleansing from guilt, along with admitting our wrongs against others and making amends, was another important part of getting to know God.
One of the most often-quoted passages regarding sin is found in 1st John 2 : 16. In this passage, John describes the three aspects of sin that recall the first and most earth-shattering temptations in all of Scripture. The first sin—the disobedience of Eve—was the result of her yielding to the same three temptations as we find in Genesis 3 : 6: the lust of the flesh (“good for food”); the lust of the eyes (“pleasing to the eye”); and the pride of life (“desirable for gaining wisdom”).
The Book of 1st 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 1st John is to set boundaries on the content of faith and to give believers assurance of their salvation.
Summary of the Book of 1st John from GotQuestions.org — is a popular Christian website and "parachurch" ministry that provides answers to a vast array of questions about the Bible, theology, and spiritual life.
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