Likutei Moharan, Part II 83:8/ליקוטי מוהר"ן·תנינא פ״ג:ח׳

18. The light of the eyes also elevates all the requests and supplications which are prayed in the direction of the Holy Temple, for all the requests ascend there. And from there the light of the eyes emerges, as in “My eyes and My heart will be there” (1 Kings 9:3).

2And the light of the eyes awakens redemption, which depends upon the heart, as in “For a day of vengeance is in My heart” (Isaiah 63:4), because His eyes and heart are there. This is the concept of “[God] called the light ‘Day’” (Genesis 1:5). The light of the eyes awakens the “day of vengeance” in the heart, to eliminate the leaven and chametz, the human heart’s inclination for evil, which remains from his youth.

3The leaven and chametz in the human heart are what instigate a person to think negatively of the generation’s Torah scholars, and to say: “This one is suitable and that one is unsuitable,” as in “Libam (Their hearts) are divided” (Hosea 10:2). LiBaM alludes to the ayin bet (72) tzaddikim of the generation. This is also “the light of the fourteenth” (Pesachim 2a)—i.e., the light in the aynayim (eyes). Through the eyes, which contain two sets of seven coatings, one searches for the chametz .