1 Peter 1:3
Praise be to the God and Father of our Lord Jesus Christ! In his great mercy he has given us new birth into a living hope through the resurrection of Jesus Christ from the dead…
In John 3 Nicodemus has a long conversation with Jesus about salvation. Jesus tells him that he must be born again. This confuses him as he knows it is not physically possible to be born a second time.
To be born again is to be born first physically and then spiritually. This new birth brings about a new life spiritually. Not only does it bring about a spiritual change, it grants a physical change as well.
At salvation we do not physically change. Instead we are given hope of resurrection. Our bodies will grow old. We will have aches and pains and be subject to sickness and disease. If the Lord does not return in our lifetime, we will die.
Death is not the end of life for the Christian however. Because of our new birth, we await the resurrection. In the twinkling of an eye the dead shall be raised to life. We will be transformed and given a new and glorified body like Jesus had after He rose from the dead.
To be born again means that we are a new spiritual person while here on earth. But it also means a new imperishable body in heaven. This should give us great hope for our future.