The essence of the 'gospel of God' -- the real good news of the kingdom -- preached by Jesus at the very beginning, and right throughout the entire period, of his public ministry is encapsulated in this verse from the New Testament: ‘The time is fulfilled, and the kingdom of God is at hand: repent and believe the gospel.’ (Mk 1:15). The nature and substance of God is love. Where God rules in peoples' hearts and lives, love rules. That means there needs to be an inward change of mind, affections, convictions and commitments -- a complete turnaround in one's life (repentance, to use a Biblical word). And what of 'faith' -- faith in God? Put simply, faith is the living and lived response of a person to the revelation of God as love in the person of Jesus. It is not something intellectual. It is something lived out in one's daily life. 'Do this and you will live' (Lk 10:28).
THE KINGDOM OF GOD---WHAT IS IT?