Philo Judaeus De Posteritate Caini 119

[119] And nearly all the troubles, and confusions, and enmities which arise among men, are about absolutely nothing, but about what is really a shadow: for Moses called Tubal the son of Zillah, that is to say of shadow, the maker of the warlike instruments of brass and iron, speaking philosophically, and being guided not by verbal technicalities, but by the exceeding propriety of the names; for he knew that every naval and every land expedition chooses to encounter the greatest dangers for the sake of bodily pleasures, or with a view to obtain a superfluity of external good things, of which nothing is firm or solid, as is testified by the history of time, which brings all things to proof: for they are like superficial sketches, being in themselves perishable and of no duration.