2. The meaning of Matzah:[1]

Michla Dihemnusa:[2] The Zohar[3] calls Matzah Michla Dihemnusa, food of faith. The reason for this is because the eating of Matzah strengthens one’s faith in G-d. This means that it helps internalized are belief in G-d’s existence to the point that His existence becomes part of our very reality and natural instincts. The Matzah helps take the encompassing faith of Makif and brings it inwards into Penimiyus, into comprehension and understanding, into Chabad. Just as the eating of grain has ability to help a toddler begin calling his father and recognizing his role, so too the eating of Matzah, which is Mitzvah grain, has ability to strengthen our belief in our Father in Heaven. Although in truth we are commanded each day to leave our personal Egypt and break the barriers between our faith and mind and instinct, nonetheless, during Pesach a special power is imbued within the G-dly soul so it be able to refine the animal soul and set within it this faith in a permanent unbending manner. This is accomplished through eating Matzah.

Gives Bittul to all seven Midos:[4] Matzah is a food of Bittul which gives Bittul to all the seven Midos, and prepares one for Matan Torah. However, only the Matzah eaten on the first night has this ability.

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[1] Regarding the two levels of Matzah that exist, Matzah of the first night until midnight, and Matzah of the other days of Pesach-See the first two Mamarim on Peach in Likkutei Torah Parshas Tzav

[2] See Derech Mirtzvosecha Mitzvas Achilas Matzah p. 44

[3] Vayeitzei 157

[4] See Likkutei Torah Parshas Pekudei p. 5 Letter 7