This Shabbat is one of those with a proper name. Generally, each Shabbat bears, so to speak, the name of the parashah read on it, but there are some Shabbatot throughout the year that have a name beyond the reading, indicating a special event. This Shabbat is called Shabbat Chazon (The Shabbat of the Vision), taking its name from the Prophets reading following the Torah reading (haftarah) that begins with the word Chazon and whose main theme is the destruction of the Temple and Jerusalem. We read this haftarah because this is the Shabbat before the fast of Tisha B'Av, the 9th of Av, the day of the destruction of both Temples, among other tragic events.
Rabbi Levi Yitzchak of Berditchev explained that this Shabbat, in addition, we are shown a vision (hence the name Shabbat of the vision) of the Third Temple, as if to awaken in each one a desire to see it built, leading this desire to do Teshuvah (return to God).
To explain this vision, Rabbi Levi Yitzchak of Berditchev gave an example: A father had a beloved son; he gave him a beautiful garment, which the son did not take proper care of and destroyed. The father gave him a second beautiful garment, which, again, the son did not take care of. The third time, the father prepared the garment, even more beautiful than the previous ones, and stored it in a wardrobe. From time to time, the father would show the garment to his son from afar, awakening in him the desire to possess it, but instead of giving it to him, he would tell him that when he knew how to care for it, he would give it to him.
The same is true in the history of the Jewish people: God gave us the First Temple, and we didn't know how to care for it. As our sages say, it was destroyed because of our lack of respect for the Torah. Then He gave us the Second Temple, and we didn't know how to care for it either; we harbored unfounded hatred. The Third Temple (like a third garment) is ready to descend from heaven (or to be built here below, a matter of debate among our sages), but God is waiting, so to speak, for us to know how to care for it.
The Shabbat before Tisha B'Av is when God shows us a vision of this Third Temple.
Now, the Jewish people enjoyed the First Temple for 410 years. The Second lasted 420 years. For much of those years, people made pilgrimages to Jerusalem, witnessed the miracles that occurred in the Temple, the Kohanim performing their duties, and so on. It was an atmosphere of holiness and purity; the Divine Presence was revealed and available. Why didn't this influence the Jewish people to change their sinful ways? Especially considering they had prophets (in every sense of the word, God spoke to them...) who warned the Jewish people of the impending disaster and showed them the way to avoid it (a return to their roots), and yet they still failed to make the people better. Will seeing the Third Temple once a year accomplish what more than 800 years and prophets could not?
To understand this, we must delve into the difference between seeing something and being shown something, both in quantity and quality. When a person sees, they don't necessarily see all the details of the thing, and they do so according to their current abilities, their own limitations. On the other hand, when a person is shown something, they are shown all the necessary details, and their vision is according to the one showing it (in this case, God Himself), who is beyond the capabilities of the one seeing.
In other words, when the Jewish people observed the Temple and everything surrounding it, they were affected only as much as they allowed, since that vision originated from within themselves. The effect was temporary and did not impact their daily lives. When God reveals the Temple, He does so in a way that affects the viewer according to His infinite divine power, modifying their behavior.
That's why the example says that "the father shows him the clothes," not that the son sees them.
Moreover, the father showed him the clothes "from afar," which means that the son understands how far he still is from being worthy of those clothes, and this generates a feeling of submission and a willingness to return and improve his behavior.
May this Shabbat be the last that we have to see the Temple in dreams and visions, so that we may see it built in Jerusalem and Tisha B'Av, instead of being a sad day, be transformed into a day of joy and rejoicing.