1 Peter 1:3

1 Peter 1:3 Blessed be the God and Father of our Lord Jesus Christ, who according to His great mercy has regenerated us unto a living hope through the resurrection of Jesus Christ from the dead,

The regeneration of the believers is the reality, the fact, of the impartation of the resurrected Christ into His believers, whom God the Father has given to Him. It is also the dispensing of the Spirit, the divine life, and the processed Triune God into the believers. 

We were born again in Christ's resurrection, but before a certain time this was not yet our experience. As we have seen Christ's resurrection was a great delivery. In resurrection Christ was delivered to be the firstborn Son of God. He took the lead, and we all followed Him to be delivered also. That was the accomplishing of the reality, the fact, that God brought forth many children through Christ's resurrection. 

- "the Central Line of the Divine Revelation" P263