Ex Luce Lucellum
To make a gain out of light; to make a cheese-paring from lucifer-matches. When Robert Lowe proposed to tax lucifer-matches, he suggested that the boxes should be labelled Ex luce lucellum.
(Parliamentary Reports, 1871.)
Lucifer aggrediens ex luce haurire lucellum Incidit in tenebras; lex nova fumus erat.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894