Biblical explanation
John states his purpose plainly: “These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life” (). Assurance rests on the finished work of Christ and the trustworthiness of His promises rather than on the strength of one's own emotions, which naturally fluctuate. Evidence of genuine faith includes a growing love for God and others, a desire to obey His Word, and the witness of the Spirit within (; ). When doubts arise, believers are encouraged to return again and again to what God has promised in Scripture rather than to their changing feelings, resting confidently on Christ's finished work rather than personal performance.
In brief
John states his purpose plainly: “These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life” ().
Bible references
Go deeper into this topic Saved by Grace: Why Did Jesus Have to Die? Start the studyThis answer is written and reviewed by the Word Oasis Editorial Team, and is presented with supporting references so you can examine each passage in context. If you notice an error or unclear statement, please suggest a correction.