We can know we are part of God's kingdom through faith in Christ, who assures us that all the Father gives Him will come to Him.
To have confidence that we are part of God's kingdom, we must look to His promises in Scripture. In John 6:37, Jesus declares, 'All that the Father giveth me shall come to me.' This promise is a cornerstone of our assurance; if we believe in Him and His word, we can know we are part of His flock. Our faith is not based on our works but on the assurance and promises of God. Those written in the Lamb's Book of Life before the foundation of the world, as stated in Revelation 17:8, will indeed come to Him, confirming their part in God's kingdom.
Scripture References:
John 6:37, Revelation 17:8, Mark 12:34, John 10:9, Luke 9:23
Commentary