Or Adonai (Hebrew: אור אֲדֹנָי),
The Light of the Lord, is the primary work of Rabbi
Hasdai Crescas (c. 1340 - 1410/1411), a Jewish philosopher. As some Jews prefer to not use even the respectful title
Adonai (Lord) other than in prayer (see
names of God in Judaism), the book is sometimes called
Or Hashem (אור השם) in verbal usage to avoid mentioning even this title of
God directly.