Of what are the twelve gates composed?

Answer

"And the twelve gates were twelve pearls: every several gate was of one pearl." Rev. 21: 21.

What is necessary in order that the preaching of the gospel may be profitable?
From what is He able to keep us?
What event does he speak of as immediately following these times of refreshing?
For how long does marriage bind the contracting parties?
What was contained in the second apartment?
For whose sake did Christ say the period of papal persecution would be shortened?
What promise is made to those that mourn?

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