Likutei Moharan 66:6/ליקוטי מוהר"ן ס״ו:ו׳

16. This is also the meaning of (Beitzah 32b): When someone is dependent on other human beings, his world chashakh (turns dark). ChaShaKh connotes an obstacle, as it is written (Genesis 39:9), “neither has he ChaSaKh (withheld) anything from me”; “because you did not ChaSaKhta (withhold) your son” (ibid. 22:16). In other words, when a person is dependent on other human beings, he experiences obstacles. This is “his world chashakh”—i.e., when he is in public, he encounters obstacles and it is difficult for him to pray honestly, as explained above. Thus when a person is dependent on human beings, it is more beneficial and easier for him to pray in private. But someone who is not dependent on other humans, who is not reliant on them for anything, can stand in the midst of thousands of people and pray honestly, to God alone. This is because he does not depend on any human being for livelihood, honor or anything else. Rather, “his hope is in God his Lord.”