The document provides background information on the First Epistle of John. It was written by John the Apostle in Ephesus between 70-90 AD to counter heresies emerging in the church, including those denying Jesus's humanity. John's purposes in writing were to encourage fellowship with God and believers, fill them with joy, promote departure from sin, and correct false teachings. The letter addresses doctrines like Docetism and Gnosticism and aims to establish believers in the true faith.