For what purpose is the mystery of the gospel made manifest?

Answer

But now [the mystery] is made manifest, and by the Scriptures of the prophets, according to the
commandment of the everlasting God, made known to all nations for the obedience of faith." Rom. 16: 26.

For what were the Bereans commended?
What was the character and the work of many of the bishops at that time?
Who did He say would be saved?
In what language had some of the Old Testament prophets already foretold these signs?
What does He say He will bring with Him when He comes?
What was the color of the symbol under the third seal?
With what announcement does the sixth trumpet close?

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