It states (Bereishis 28:12) ָּׁמ ָיְמָההַש מַגִּיעַ וְרֹאשׁוֹ א ַרְצָה מ ֻצָּב ס ֻלָּם וְה ִנֵּה, "Behold, he dreamed that the ladder stood on the earth and its head reached the heaven." The Shefa Chaim of Klausenberg zt'l said that ס ֻלָּם is gematria ן"עי. This tells us that the eyes are the ladder to climb up to the heavens. If one guards his eyes, even if he is down on earth, he will reach the heavens. However, if he doesn't guard his eyes, בּוֹ וְיֹרְדִים עֹלִים א ֱלֹק ִים מ ַלְאֲכֵי וְה ִנֵּה, "Behold malachim of Hashem were ascending and descending on it." This means that even if he is like a malach, if he doesn't guard his eyes, he will fall to low levels.
Reb Dovid Baharan zt'l was from the tzaddikim in Yerushalayim. He lived in the Shaarei Chesed neighborhood, and among his many chumros was that he ate matzos that were baked in the ראשון תנור, first oven (the first batch of matzah of the day). To do so, he would daven at vasikin, take the first bus to Givat Shaul, Yerushalayim, where there was a matzah bakery so that he could be by the first baking of the day. He was also cautious to sit directly behind the bus driver. This way, he wouldn't sit behind someone it was forbidden to sit behind, and he could guard his eyes.
One year, he was about to board the bus, but he saw that someone had already taken his seat. He immediately stepped down. His son asked him, "What will be with the matzos this year? The next bus is in an hour, and by then, they will begin baking matzos..."
Reb Dovid Baharan replied, "I will take the next bus. Every year, I have a hidur with the matzos; this year, I will have a hidur with shemiras einayim."
He took the next bus, and surprisingly, for some reason, they hadn't begun baking yet. So, he was able to keep both chumros. (This last point is not related to the story. The point of the story was that he was ready to forgo the chumrah of matzah to be machmir with his eyes. But we tell as an "aside" that Hashem helped him keep both chumros. He had the matzos from the first baking, and he guarded his eyes.)
Reb Yitzchak Dovid Gutfarb zt'l was walking in the old city of Yerushalayim to go to the Kosel, and there were Arabs there, throwing large stones, large enough to kill a person. Reb Shayah Cheshin zt'l was walking behind Reb Yitzchak Dovid, and he understood Arabic. He heard the Arabs say to one another, "Don't throw stones on Reb Yitzchak Dovid, because he guards his eyes." It is a wondrous story. Even goyim understand that it isn't worthwhile to start up with someone who guards his eye. Hashem protects him.
