But these are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in his name.
For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.
My sheep listen to my voice; I know them, and they follow me.
I write these things to you who believe in the name of the Son of God so that you may know that you have eternal life.
(1st Epistle of John 5.13)