It states (Eichah 1:3) כל רודפיה השיגוה בין המיצרים “all her pursuers overtook her between the boundaries.” The Koznitzer Magid zt'l (Avodas Yisrael, Avos 2:14) writes that כל רודפיה means כל רודף השם, whoever pursues Hashem השיגוה, can attain a connection with Hashem, בין המיצרים in the days of Bein HaMetzarim. During these days, it is easier for a person to become close to Hashem than the rest of the year. Interestingly, it is different than what we would assume. We think that during these days of mourning we are distant from Hashem, when actually, it is during this time of year that we have the greatest potential to become close to Hashem.
He brings a hint to this from the pasuk (Shemos 3:14) אהי"ה אשר אהי"ה. The gematria of אהי"ה is 21. Thus the pasuk can be translated אהי"ה Hashem says, "I will be with the Jewish nation אשר אהי"ה, during the 21 days of Bein HaMetzarim.
Why is it easier to become close to Hashem these days? The Koznitzer Magid explains with a mashal:
"When a king is in his palace, it is hard for people to reach him. Guards surround the king and keep people from coming near. [Furthermore, if he is granted an audience with the king], he will need to present the king with a precious gift. But when the king is traveling, it is easy to get to the king, and a small present will be in the king's eyes like a large gift... The king will accept the present with a happy countenance, and this is because he is traveling...
So, the Three Weeks is a time for Torah study, a time to come closer to Hashem.
