Flank burning, to an art hard to be guessed
I showed the way to mortals; and flammeous signs
Explained, before obscure.
Such indeed these; and under ground
Concealed the helps to men;
Brass, iron, silver, gold, who
Would affirm that he discovered before me?
None, I well know, not wishing in vain to boast.
But learn all in one word,
All arts to mortals from Prometheus.