equidem

Equidem is quidem with a prefix, and it is a speaker's particle: it marks off what I think from what everybody else has been saying. "For my part" catches it better than "indeed" does, and the pairing with a first-person verb is overwhelming in Cicero, who happily writes equidem ego, which only looks tautologous.

It stands early in its clause and asks for no particular mood. A third-person equidem is not impossible but is rare enough to be worth a second look at the text. The old grammarians derived it from ego plus quidem, which is folk etymology - the e- is more likely the same intensive prefix as in ecce - but since the usage matches the folk story exactly, remembering it that way does no harm.