Yet another reason why we should love one another is that we are all children of the same heavenly Father. The first part of this verse is not about personal assurance – ‘How do I know that I am born of God?’ – but about identification of other believers – ‘How do I know that my neighbour is born of God?’ We must recognise that all those who believe that Jesus is the Christ, the eternal Son of God made flesh, are born of God and are therefore to be treated as God’s children.