Haggai focused on the importance of the temple to the Jews, urging them to make it’s reconstruction a priority. He also criticized materialism and self-centeredness, advocating a timeless message of making God the people’s priority and focus.
Haggai is sometimes called a minor prophet. This doesn’t mean he wasn’t important, but merely that the book named after him is shorter.
(Compare this to the major prophets, whose books are much longer.)
Dig into the intriguing lives and ministries of the Bible’s twelve minor prophets in Peter DeHaan’s book Dear Theophilus, Minor Prophets: 40 Prophetic Teachings about Unfaithfulness, Punishment, and Hope.
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 700-page website ABibleADay.com to encourage people to explore the Bible. His main blog and numerous books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.