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.

By whom was this fulfilled?
What is declared to be one purpose of Christ's death?
What are we exhorted by, the prophet to seek?
How was the prophecy given?
Will the Sabbath be observed as a day of worship in the new earth?
When John the Baptist was asked if he were Elijah, what did he say?
What did the Sadducces in Christ's time deny?

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