Regeneration is impossible without free will in spiritual matters.

Anyone who is not stupid can see that without free will in spiritual matters no one can be regenerated. Without that he could not approach the Lord and acknowledge Him as Redeemer and Saviour, and as the God of heaven and earth, as He Himself teaches (Matt. 28:18). Can anyone without that free will believe, that is, look to and worship Him from faith, devoting himself to receiving from Him the means to and benefits of salvation, and co-operating in receiving them from Him? Can anyone without free will do any good to his neighbour and show charity, not to mention absorbing into thought and will many other features of faith and charity, and drawing upon them to put them into effect? Otherwise regeneration would be nothing but a meaningless expression which dropped from the Lord's lips (John chapter 3), something which penetrates no further than the ear, or if it falls from the lips as the result of the thought which is closest to speech, is merely an articulate sound composed of eleven letters*. This sound has no meaning by which it can be raised to any higher level in the mind, but it falls upon empty air and is lost.

* The Latin word regeneratio, 'being born again' or 'regeneration' has eleven letters.