Following one of His parables, what did Christ say?

Answer

"Who hath ears to hear, let him hear." Matt. 13: 9.

How does David express this same truth?
How many may receive this gift?
How does Paul, speaking of the man of sin, describe this same power?
By what is the knowledge of sin?
Of what did Christ say the Son of man is Lord?
What trying experience did Christ then foretell?
Did this doctrine exist in ancient times?

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