Haggai 1:1 In the second year of Darius the king, in the sixth month, in the first day of the month, came the word of the Lord by Haggai the prophet unto Zerubbabel the son of Shealtiel, governor of Judah and to Joshua (Joshua 11:18) the high priest who was the son of Josedech, saying,

Haggai 1:5 Now therefore thus says the Lord of hosts; Consider your ways.

Haggai 1:6 You have sown much and bring in little. You eat, but you have not enough. You drink, but you are not filled with drink. You clothe yourself, but there is none warm. And he that earns wages earns wages to put it into a bag with holes.

In other words, the things of life are constantly being used up and more is always required (Lamentations 5:5 "Our necks are under persecution. We labour and have no rest."), with the message being, be smart enough to seek more than just this:.Proverbs 16:3 "Commit your works unto the Lord and your thoughts shall be established."

Learn who has brought negatives into the world to afflict humankind. It was Satan and these are carried out today in the depopulation agenda of these criminals.

Haggai 1:7 Thus says the Lord of hosts; Consider your ways. 

Haggai 1:13 Then spake Haggai the Lord's messenger in the Lord's message unto the people, saying, I am with you, says the Lord. 

Haggai 2:4 Yet now be strong, O Zerubbabel, says the Lord and be strong, O Joshua, son of Josedech, the high priest.(not the Joshua whose name there is a book of the Bible).and be strong, all you people of the land, says the Lord and work, for I am with you, says the Lord of hosts.

Haggai 2:5 According to the word that I covenanted with you.(Exodus 24:3).when you came out of Egypt.(*), so my spirit remains among you. Fear you not.

When one's heart is all for God, there is nothing to fear. How powerful is the one and only good and true God?

Haggai 2:6 For thus says the Lord of hosts, Yet once, it is a little while and I will shake the heavens and the Earth and the sea and the dry land.

Revelation 16:18.

Haggai 2:7 And I will fill this house.(what house?.Jeremiah 7:14,15).with glory, said the Lord of hosts. 

Haggai 2:8 The silver is mine and the gold is mine, says the Lord of hosts. 

Haggai 2:9 The glory of this latter house shall be greater than of the former, says the Lord of hosts. And in this place will I give peace, said the Lord of hosts.

John 14:27.

Haggai 2:15 And now, I pray you, consider from this day and upward, from before a stone was laid upon a stone in the temple of the Lord.

Haggai 2:18 Consider now from this day and upward, from the four and twentieth day of the ninth month, even from the day that the foundation of the Lord's temple was laid, consider it.

Comprised with Barnes Notes: Consider what? Consider that from the moment the first stone was laid to build the structure of this now ancient temple in Jerusalem, that both the city and temple were destroyed because the adversity upon people there was due to their evil ways bringing ruin upon their country.

....next Old Testament book is Zechariah