Nicodemus: 'We know that you are a teacher having come from God. For no one is able [dunatai] to do these signs that you do unless God is with him.'
Jesus: 'I tell you, unless someone is born again, he is not able [dunatai] to see the kingdom of God.'
Nicodemus: 'How is a man able [dunatai] to be born, being old? He is not able [dunatai] to enter a second time into his mother's womb and be born, is he?'
Jesus: 'I tell you, unless someone is born not only of water but also of the Spirit, he is not able [dunatai] to enter into the kingdom of God. . . . The Spirit blows where it wills. . . .'
Nicodemus: 'How is it possible [dunatai] that these things are so?'
In Jesus, all intuitive and reasonable limits and prerequisites to what is humanly possible (dunatai) are swept away as we are ushered into a new universe of possibilities in which God and his happy omnipotence of grace--not we and our puzzled 'But . . .'--defines how real Life takes place.