Fear of the King
“Rabbi Nahman ben Isaac’s mother was told by astrologers, ‘Your son will be a thief.’ [So] she did not let him [go] bareheaded, saying to him, ‘Cover your head so that the fear of heaven may be upon you, and pray [for mercy].’ Now, he did not know why she spoke that to him [and thus disregarded her instruction]. One day he was sitting and studying under a palm tree; the evil impulse overcame him, he climbed up and bit off a cluster [of dates] with his teeth” (BT Shabbat 156b).
“Because the Shekhinah is over his head the sages of the Mishnah taught: A scholar of the Law is forbidden to walk four cubits with his head uncovered [cf. BT Qiddushin 31a] because, the whole earth is full of His glory [Isaiah 6:3]. And even more so to go with uncovered head during a blessing or the mention of the Holy Name! [And the reason for the prohibition of going with an uncovered head:] י of יהוה is enveloped in אוֹר light, and becomes אֲוִיר ether, since י, which is Hokhmah, is in the ether/air/climate [cf. BT Baba Batra 158b; Tiqqunei ha-Zohar 5]. And this is the light with which He enveloped himself when He created the world, as it is written: Wrapped in light like a cloak, stretching out heavens like a tent-cloth [Psalms 104:2]. Thus Let there be אוֹר light [Genesis 1:3] is ‘Let there be אֲוִיר ether.’ And the sages of the Secrets of Torah taught: Before anything else was formed, the existences were formed. Thus: Let there be light, and there was light - that had existed previously” (Ra’aya Meheimna Pinhas).