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.

How thoroughly will the effects of sin he removed?
By what means is sin made known?
How did Jesus emphasize the necessity of conversion?
Why must justifying faith lay hold upon both the death and the resurrection of Christ?
What enabled Abraham to endure the test?
While in this condition, how much does one know about those he has left behind?
What therefore follows?

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