What is the relationship between free will and the kingdom of God that is within us through divine grace?

St. Cyril of Alexandria says, “‘For behold! The kingdom of God is within you.’ For ask not, He says, about the times in which the season of the kingdom of heaven shall again arise and come [Luke 17:20–36]: but rather be in earnest, that you may be found worthy of it, for ‘it is within you,’ that is, it depends upon your own wills, and is in your own power, whether or not you receive it. For every man who has attained to justification by means of faith in Christ, and is adorned by all virtue, is counted worthy of the kingdom of heavens.”¹⁰⁶⁵