I've been wracking my brain over this one because it feels like one I should know! I think we are all just patiently chipping away at it,
Drone! No worries.

Ok, here's what we know so far of your clue:
"I can only take small doses of Vulcan philosophy".
"This sounds like either Janeway, Archer, Pulaski, Phlox, or Lore - Amanda in TNG's Sarek?"
"The correct answer comes from a series in which one of the characters you were running through as possibilities appears."
"Archer in 'The Forge'?" (triology)
"...you are interestingly close...not because of the inherent content contained in the episode...the quote is NOT from Enterprise. "
"...It's really not that obscure..."
"A major character in the episode the quote is drawn from, has never, to the best of my knowledge, been seen other than on Earth..."
"I really think it's considerably more straightforward than 'Females'!!"
This leaves TNG and Voyager. An episode with a supporting character on Earth, though we don't know if they appear in only one episode or more. Perhaps an admiral in Starfleet Command, or one of those the Voyager crew was calling home in
Author Author. Janes spoke with -
Oh, is it the Arbiter from
Author Author?