Using wheat for matzah

Hi,

"Another reason why we use wheat, specifically, for matzah, is that the Talmud (Berachot 61) compares the inclination for sin to a wheat kernel. We grind up that wheat in a mill, like one who is humbling his inclination for sin."

(Taamei haMinhagim 493)

Have a great day,
Mordechai