How do we know that God's kingdom is true?

The truth of God's kingdom is validated through the life and ministry of Jesus Christ, who preached the Gospel and established the kingdom through His sacrifice. As noted in Mark 1:15, Jesus proclaimed, 'The kingdom of heaven is at hand; repent and believe in the gospel.' His resurrection signifies the validation of His message and the inauguration of God's kingdom on earth. Moreover, the continued growth and influence of the church, even from small beginnings, point to the reality and truth of the kingdom that God is building, which will not be thwarted.