Most fast days are for crying out and selichos. Today we only have selichos.
Today is the beginning thefoundation of teshuva. Hakaras hacheit. That’s the yesod of aveilos. I can’t go on business as usual i have to stop and think and recognize what I’m missing. On 9 Bav aveilos is backwards. Normally shiva starts intensely, by the end is a little less, then 30 then 12. We should have started ,ourning on 9 av and then had nine days and then bein hametzarim. Why is it inverted? Because regular aveilus hits someone like a ton of bricks, and chaza wanted people to be able to ease back into life again. Here it’s impossible to arrive at 9 bav andfeel like meiso mutal lifanav without extreme preparation.
rambam - the difference between now and yemos hamoshiach is only shibud hamalchios. Also he says they’ll be no sickness no hatred no suffering no poverty - sound supernatural. Rambam means that we’re used to a handicapped world and the natural world as it’s supposed to be seems to be supernatural.
motions create emotions.
first stop dancing listening to music harcuts shaving, then no meat no wine bathing clothes… Erev tisha bav - finally now you have a CHANCE to maybe feel that something’s missing.
zoche vroeh bbinyan yerushalayim. Roeh doesnt necessarily meam to see with your eyes. Roeh ani as divrei.... It means to understand. Kol hamisabel al yerushalyim will be zoche tp understand and see what’s missing and what the simcha could be in the future. And that’ the moed of 9 bav. Kinnos = kiton - a flask. Full of tears. Crying like a tinnok - he knows he’s missing something (cold wet tired) - he can’t articulate the issue but he knows that if he cries loud enough, someone who cares will come and know what the problem is and fix it.
Through aveilos we become more spiritual. Rashba - part of aveilus is to feel the tzaar of the neshama being pulled away from the gashmius of this world.
First three days the neshama is bewildered - goes from house to kever back ad forth. Next four days less confused. Next 30 less. Next 12 finally gets settled. So the aveilim also discomfort themselves in the same order to be able to feel the tzaar of the neshama. We remove our connection to some extent from the gashmius of this world.
There’s currently a real beis haikdash - lemaala. If you can connect to that - become senstivie to the spritual world - by not being involved in olam haze. Just like an aveil is sensitive to the neshama we can become sensitive to the tzaar of the neshama of the olam - the ribono shel olam. How hated are we in this world. And yet we should be emissaries of Hashem. How much pain it must cause Him to see how we are treated.
Mishna in taanis says never made a full day taanis on sunday because it’s pikuach nefesh to go from shabbos straight into a full day taanis. That was referring to zman hamikdash. Shabos was like mamesh mein olam haba. To go from that to a taanis would be a sakana. But our kind of shabbos… No problem.
Mabit says we used to only had one day of fast - yom kippur. It inspires you to do teshuva. It’s like a day in gan eden. No eating - you’re full from yesterday. - you’re separate from this world - and you enter like a angel in white into olam haba for a day. Everyone is friendly there’s achdus - you feel pure you understand what a completee world is like. When you go through that - you have an incentive to do teshuva the rest of the year - to get back to that point. You felt that whe there was a beis haikdash. After the churban shabbos is diminished shabbos shabbason too. It’s a shadow of what yk once was. It was a room of dazzling light. 
After churban, yk is no longer dazzling. So in order to be dazzled, you need to first go into a pitch black cellar for a few hours. First go spend a day in gehinom. No torah no shalom. 21 days (3*7) chazakah of a full unit of time to get ready - now another 21 days to prepare for elul. Elul starts the process of preparing for yk.
sain kinnos today is a preparation tha our yk can really be a day of teshuva.
Further - When you really recognize what’s missing - you beegin to really want to replace them,
and Hashem doesnt do until we’ve done our best. You have to show Hashem you want Geula. And there are mitzvos that are mekareiv the geula. We’ll speak about nine of them. Just making up your mind to do them is like you’ve done them.

Vhaareinu bvinyana. Enlighten us to understand what we can do that will lead to binyan beis hamikdash. The keitz is very close - we only need a little bit of avodah. - chofetz chaim

Roui lchol yirei samayim lhisabel al beis haikdash. Says chidushei haRim - because if you’re not a yirei shamayim you need to first mourn the personal churban you have of nwing empty.

Every tzara is a result of the churban. If we had a bm we wouldn’t see this world as normal. There’s hatred, sickness, early death, horrific accidents, jewish soldiers wounded and killed, parents of gilad, held by animals - worse than animals.
that’s churban. It’s very personal. It’s even the little things - that’s chuban.
(when your cients don’t pay - when your renters don’t leave - that’s churban)
this is a shabbos - a shavas from simcha - a chance to see whats really missing.