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.

Who was the Rock that went with them?
What is the ultimate purpose of faith?
Through what does grace reign unto eternal life?
Does faith render the law void?
When and by whom was the Council of Nice convened?
What was the object of the church bishops in securing these Sunday laws?
When was there a wonderful darkening of the sun?

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