God's Word is certain.
So what was the point of Jesus Challenging Nicodemus ?
We are not robots, programmed to live untill a set time and then downoad a new progrsamme.
We are thinking, moral, spiritual flawed beings, made in the image of God.
Whilw God has planned creation, salvation etc etc we still have a responcibility to respond to God.
Just as od is gracious in saving us so he is also gentle in how he deals with us.
Not everyone is blinded by a sight of Gods glory like Saul/Paul was.