True Left

"at the earliest"

It is logically possible to say that a word appeared at Time t at the latest by finding an instance of the word at t. It is logically impossible to say that a word appeared at t at the earliest, as the earliest known instance of the word at t does not preclude earlier usage.

Wrong. As "earliest known instance of the word does not preclude earlier usage", so does finding the suposedly latest instance of a word not preclude even later (as of yet unknown) usage. That is, finding an instance of a word only expands the range of time on which the usage of said word is confirmed.
Either way, this is tangential to the topic.

Keep coping.

EDIT: changed "hardly tangential" to "tangential." The intended meaning stays the same, but this way its easier to infer it, even if previously the context was enough, in my opinion. (The intended meaning was that the argument was not related to the topic (hardly tangential, in the sense of hardly even lightly touching)).

That is a matter of opinion. It could be argued that dyeu itself comes from dia, as for something to shine, the light must travel across/through space from the source to the eye.

OMFG THE AMMOUNT OF HUBRIS
> It could be argued that dyeu itself comes from dia
No, in fact, it couldn't be argued, since that's really, really, really stupid, and shows how little you know.
"It could be argued that dyeu itself comes from dia" oh yeah? For real? *Dyeu-, a word from Proto-Indo-European that was spoken between 4500 BC and 2500 BC, is derived from diá-, a word from Ancient Greek, that was spoken since 900BC at the earliest? I didn't know Ancient Greeks had time travel!
Imagine how much hubris do you have to have to open your mouth when you very clearly know jack **** about anything remotely related to the topic.

LMAO the amounts of reaching and bullshit you spew are incredible.
Also, no, it's not "opinion" (LMAO), but rather, rigurous derivation and etymological research.

The dia- in diabolos comes from *δισα (disa, since you probably can't read greek), from Proto-Indo-European *dwís (related to δίς (dís, “twice”) and δύο (dúo, “two”)). *dwís comes from *dwóh₁.
The ultimate root for divine is Proto-Indo-European *deywós, through Latin deus, and Old French divin.
So, not even remotely connected etymologies.
Not related at all. ChristianBethel, don't trust this dude.
Either way, the meaning or connotation of neither word comes from VEDIC AND PERSIAN USE.