Ancient of Days

Keter of Atzilut acts as the guiding Divine motivation in creation, developing into two partzufim, Atik Yomin (Ancient of Days) and Arich Anpin ("Long Visage/Infinitely Patient One").

[3] In the descending realms explained by Luria, the Gulgalta ("Skull"-Keter Will) within Arich Anpin enclothes the Chesed (Kindness) of Atik Yomin, becoming the origin of the lights of the world of Atzilut; the Mocha Stima'ah ("Concealed Brain"—Chokmah Wisdom) within Arich Anpin enclothes the Gevurah (Severity) of Atik Yomin, becoming the origin of the vessels of the world of Atzilut.

[4] The Dikna ("Beard") of Arich Anpin constricts the infinite light originating from Atik Yomin in 13 channels of rectification to lower, relatively finite reality.

[12][13] In the hymn "Immortal, Invisible, God only Wise" (lyrics Walter C. Smith, 1867), the last two lines of the first verse read: Most blessed, most glorious, the Ancient of Days, Almighty, victorious, Thy great Name we praise.

In the hymn "O Worship the King" (lyrics Robert Grant, 1833), the last two lines of the first verse read: Our shield and defender, the Ancient of Days, pavilioned in splendor and girded with praise.

In the Church of Jesus Christ of Latter-day Saints, the title Ancient of Days belongs to Adam, the oldest and earliest man, who is also identified with the archangel Michael.

The Ancient of Days (1794). Watercolor etching by William Blake . For Blake, however, this was a title of Urizen (the demiurge in his prophetic books ).
The Ancient of Days , a 14th-century fresco from Ubisi , Georgia