We are approaching the 17th of Tammuz, a day on which, among other things, the wall of Jerusalem was breached in the year 69 CE, an event that led to the destruction of the First Temple and the exile of the Jewish people.
It is a day of fasting. Yet it is the day on which the final redemption begins. That is to say, precisely because the city was breached, the Temple burned, and the people taken into exile, we can return.
Everything that happens in a person's life has unimaginable repercussions, as modern science well knows: a butterfly flapping its wings at one end of the world can generate a tsunami at the other. How much more so the actions of human beings. Just to give one example, the way one raises a child affects that child, their children, and all future generations.
Similarly, regarding the 17th of Tammuz: it is the first step toward redemption. However, things could have been different. We could have acted better to avoid having to go through a 17th of Tammuz (or the exile we are currently experiencing). While what has already happened is history, we must learn from it for our future.
The ultimate goal for which God created the universe will come to pass, because that is God's will. We choose, through our actions, whether we go through another 17th of Tammuz and wait thousands more years to return, or whether from the very beginning we bypass all these sufferings of exile and bring Messiah NOW.