Part sermon, part family letter, 1 John is a passionate and pastoral response to a church in crisis. Written by an elder who was an eyewitness to Jesus, it aims to reassure believers who have been shaken by false teachers. These teachers denied Jesus's true humanity and claimed a secret knowledge that excused them from obedience and love. John counters this by providing three clear tests of genuine faith: Do you believe Jesus is the Christ who came in the flesh? Do you obey God's commands? And do you love your fellow believers? By returning to these fundamentals—truth, obedience, and love—John grounds his readers' faith, assuring them that they truly know God and possess eternal life.