I'm going back over parts of Diogenes Laertius for a research project, and noticed a reference to Empedocles' elements:
He used to assert that there were four elements, fire, water, earth, and air. And that that is friendship by which they are united, and discord by which they are separated. And he speaks thus on this subject:—
Bright Jove, life-giving Juno, Pluto dark,
And Nestis, who fills mortal eyes with tears.
Meaning by Jove fire, by Juno the earth, by Pluto the air, and by Nestis water. And these things, says he, never cease alternating with one another; inasmuch as this arrangement is perpetual.
I knew of the reference, of course, but when I was first digging into this, I had assumed Jove was fire, Juno was air, Proserpine was water, and Pluto was earth; I had been corrected on this citing a number of sources, including especially John Opsopaus, who gives Hades as fire, Jove as air, Proserpine as water, and Juno as earth! Well, here is Diogenes Laertius disagreeing with both of us and giving a third set of associations!
His linking of Juno with earth and Pluto with air confuses me. No matter how much I study, I fear I'll never understand what the gods meant to the ancients.