How do we know regeneration is a work of God?

The truth of regeneration being a work of God is evident through various passages in Scripture, primarily centered around the themes of divine sovereignty and the inability of man to attain spiritual life on his own. In John 3:3, Jesus told Nicodemus, 'Unless one is born again, he cannot see the kingdom of God,’ highlighting that spiritual rebirth is necessary and initiated by God. Furthermore, the Scriptures affirm that this regeneration is not based on human lineage or effort, as emphasized in John 1:13: 'Who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.' This underlines that regeneration, like creation, is uniquely a result of God’s initiative, reinforcing the doctrine that it is by grace through faith that we are saved, and not by our own works.