Purpose of Writing: John 20:31 cites the purpose as follows: "But these are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name." Unlike the three synoptic Gospels, John’s purpose is not to present a chronological narrative of the life of Christ, but to display His deity. John was not only seeking to strengthen the faith of second-generation believers and bring about faith in others, but he also sought to correct a false teaching that was spreading.
Kusudi la Kuandika: Yohana 20:31 inatoa lengo kama ifuatavyo: "Lakini hizi zimeandikwa ili mpate kuamini kwamba Yesu ni Kristo, Mwana wa Mungu, na kwa kuamini mpate kuwa na uzima kwa jina lake." Tofauti na muhtasari tatu ya Injili, lengo la Yohana si kuwasilisha masimulizi ya kihistoria ya maisha ya Kristo, lakini kuonyesha uungu wake. Yohana hakuwa anatafuta tu kuimarisha imani ya waumini wa kizazi cha pili pamoja na kuleta imani kwa wengine, lakini pia alitaka kurekebisha mafundisho ya uongo ambayo yalikuwa yanaenea.