How did Jesus emphasize the necessity of conversion?

Answer

"Verily I say unto you, Except you be converted, and become as little children, you shall not enter into the
kingdom of heaven!' Matt. 18: 3.

What record answers to this prophecy?
What are the evidences that one has been born of God?
What promise is made to those who repent and are baptized ?
How did His questions and answers impress those who heard Him?
Of what was this memorial to he a sign?
In ministering to the needy, whom are we really serving?
Who is to reign finally over God's kingdom?

Questions & Answers are from the book Bible Readings for the Home Circle