Haggai gently draws attention to the contrast between past and present and invites them to own it. He reminds them that their days of glory lie in the past. There was once a day when Davidic kings rules in Jerusalem, all they have now is Zerubbabel the son of Shealtiel. His genealogy is okay but in reality he is a �governor� appointed by the Persians.
There was once a day when they had quality high priests, people whose position no one would query. All they have now is Joshua son of Jehozadak - disparaged by local people who had not been in exile as one tainted by the impurity of exile.
There was once a day when they were a real people, a people to be reckoned with in the Middle East, now they are merely a remnant, and we all know what a remnant is - the left over bits of wallpaper or carpet sold of cheaply by shops.
Haggai particularly notes that they had a real temple then; now it has lost the covenant chest, the covenant stones, the cherubim, the pot of manna, Aaron's rod, the urin and the thummim, the imported wooden panelling, the gold... people old enough to remember the first temple see the new temple the community is trying to build as less than nothing, they weep for its empty shell.
Facing facts is difficult. It is true for us as individuals, it is true for us as a church: it is tempting to hide from the fact that the church in this country is declining at a rapid rate and that there is no reason why we should be an exception. So how can we face these facts?
Haggai believes the that the key is to consider the invisible fact about the present.
In his first prophecy he was rather confrontational in rebuking them about their commitment to God. Here he wants to be encouraging. The invisible facts about the present are what makes it possible to face the real fact about the past:

I am with you, be strong, says Yahweh Sebaot.

The phrase is Haggai�s special title for God, English translations have the LORD Almighty - which waters it down. More accurate would be Yahweh Armies - a concrete and vivid expression of the power of God, which the people of God need to believe in. Today we may say �be strong for the LORD SAS is with you�. You are more than ordinary people because this God is with you.

My Spirit remains strong among you. Do not be afraid. Remember how it was when I brought you out of Egypt.

The hidden facts about God in the present provide a context in which we face facts about an individual's illness, or about a nation which has lost an empire and not found a role, or about a church in decline. Hope lies not in doctrinal soundness or trendiness or social involvement or the latest Charismatic bandwagon. Haggai�s encouragement in is God. The resource of the church is God active in a hidden way building up the people of God as a temple of the Holy Spirit.
As well as facing the facts about the past and the hidden facts about the present, Haggai wants them to look at the guaranteed facts about the future.

Faith means being sure of what we hope for and certain of what we do not see (Heb 11:1).
I will fill this house with glory, God says.

The recurrent word in Haggai is glory. For Israel it will mean peace (NIV) or prosperity (RSV), both aspects of Goddess shalom.
But it will come about for Goddess glory and not merely for Israelis sake;
It will come about by an act of God; - it was God who filled the temple with glory before and he will do so again; human beings cannot make it happen on their own. It is dependent on God acting, on God shaking, it will come about as part of the final reordering of things.
An in saying God shaking, it means that all will not be quiet, when God acts there is upheaval and for Zechariah that was a promise not a threat.
As so often is the case, it did not happen fully in the prophet's lifetime, but something did - a kind of foretaste - you'll have to read Ezra 6 to see what it was.
But it is also often like this with healing and with peace among nations and with renewal in the church: We ask for gifts and graces of God which belong to the End when God will reconcile all things, heal all things, cease all tears et..... They will only fully become a reality at the End, but we have to look for foretastes of what is to come - and these are what we may receive in the meantime, and these are what we are to rejoice in - for what they are and for what they themselves promise.

The facts about the future are guaranteed by the Word of Yahweh Armies - Almighty God. When God speaks, things will happen. Lets face the facts and do as God calls.