Shabbat HaGadol Shalom
Dixie Yid, quoting Reb Itchie Mayer Morgenstern:
The Chasam Sofer taught that Shabbos HaGadol is particularly auspicious for the arrival of Moshiach. The K’sav Sofer explained that even though the Arizal taught that Eliyahu HaNavi will not come on Shabbos, nevertheless Moshiach will come before Shabbos and remain hidden until he is revealed on Shabbos. This Shabbos [before Pesach] is especially suited to the revelation of the concept of, “His Name is sure”—that the Jewish people have the ability to bring the redemption provided that they do not fall into doubts about the worthiness or effectiveness of their prayers. “His Name is sure”—we certainly can bring about the required salvation. In the merit of this faith, the redemption is drawn down.
This is the meaning of the haftarah of Shabbos HaGadol: that Hashem derives pleasure when a person connects with the holiness of prayer and doesn’t fall into the doubts of the world of Asiyah. Rather, the night of Pesach empowers him to attain clear and pure faith that Hashem hears ours prayers. This is why the redemption really depends on achieving a yichud in the world of Asiyah, which in turn strengthens us to beg for the redemption just as they cried out in Egypt. “And we will cry out to Hashem our G-d, and Hashem will hear our voices and see our affliction.”