Likutei Moharan 2:5/ליקוטי מוהר"ן ב׳:ה׳

15. Now, the main cause of foreign thoughts <during prayer> is the corruption of mishpat. For mishpat is an aspect of AYNin (eyes), as in (Genesis 14:7), “They came to AYN Mishpat.” This corresponds to “[Israel will dwell securely, apart,] AYN Yaakov…” (Deuteronomy 33:28).

2And through the corruption of <the> mishpat, the eyes are impaired, as in (Deuteronomy 16:19), “For bribery blinds the eyes of the wise.” This is the concept of foreign thoughts during prayer. They are like clouds covering the eyes, as is written (Lamentations 3:44), “[God,] You have covered Yourself with a cloud, so that prayer should not pass through.”

3But in the Future, the concept of mishpat shall be restored, as in (Isaiah 1:27), “Zion shall be redeemed through mishpat <and her captives through charity>.” Then, the clouds that cover the eyes will pass, as in (ibid. 52:8), “for eye to eye they will see God returning to Zion.” And this is why Yosef is called “bein porat aley AYiN (a fruitful bough by the well)” (Genesis 49:22).