John 3:12 If I have told you earthly things and you do not believe, how can you believe if I tell you heavenly things?
The only time Jesus mentions being born again is in a theological discussion with Nicodemus alone, in private, at night.
Granted God inspired John to reveal this conversation for us but during Jesus’ earthly ministry He did not reveal this most important issue to the masses. To them He spoke in parables.
Luke 8:9-11 English Standard Version
The Purpose of the Parables
9 And when his disciples asked him what this parable meant, 10 he said, “To you it has been given to know the secrets of the kingdom of God, but for others they are in parables, so that ‘seeing they may not see, and hearing they may not understand.’ 11 Now the parable is this: The seed is the word of God.
Allow me to act like a child, “Why?”
Isaiah 6:9-10 English Standard Version
9 And he said, “Go, and say to this people: “‘Keep on hearing, but do not understand;
keep on seeing, but do not perceive.’ 10 Make the heart of this people dull, and their ears heavy, and blind their eyes; lest they see with their eyes, and hear with their ears, and understand with their hearts, and turn and be healed.”
But why?
The understanding heart is only possible if we are born again which is impossible without placing our faith in Jesus Christ and His atoning work on the Cross.
Jesus is the only way. We cannot get there without Him.