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.

Why cannot the natural man receive the things of the Spirit?
How closely are righteousness and life thus united?
What did Jesus declare God's commandments to be?
How was the opening of the judgment to be made known to the world?
In what were the laws or commandments respecting sacrifices and burnt offerings written?
What is Peter's testimony regarding it?
What else has He promised to do?

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