Grocott & Ward, comps. Grocott’s Familiar Quotations, 6th ed. 189-?.

Ex Fumo Dare Lucem

To give light from smoke.
Horace.—Art of Poetry. [Motto of the Liverpool Gas Company.]

One with a flash begins, and ends in smoke,
The other out of smoke brings glorious light.
Roscommon.—Horace’s Art of Poetry.

Sudden to glare, and in a smoke expire;
But rises from a cloud of smoke to light.
Francis.—Horace’s Art of Poetry. Line 206.