Let There Be Light - Origin and Etymology

Origin and Etymology

The Latin phrase fiat lux, from the Latin Vulgate Bible, is typically translated as "let there be light" when relating to Genesis 1:3 (Hebrew: "יְהִי אוֹר"). The full phrase is "dixitque Deus fiat lux et facta est lux" ("And said God let there be light, and there was light"), from the Greek "και είπεν ο Θεός γενηθήτω φως και εγένετο φως" (kai eipen ho Theos genēthētō phōs kai egeneto phōs), from the Hebrew "וַיֹּאמֶר אֱלֹהִים, יְהִי אוֹר; וַיְהִי אוֹר" (vayo'mer 'Elohiym yehiy 'or vayehiy 'or).

Since fiat lux would be literally translated as "let light be made" (fiat is from fieri, the passive form of the verb facere, "to make" or "to do"), an alternative Latinization of the original Greek and Hebrew, lux sit ("light - let it exist" or "let light exist") has been used occasionally, although there is debate as to its accuracy.