AFAIK, almost all quests (except those you find from a book or object in the world) are voice-acted. You need to read the screen to select your dialogue, of course.
"If a person is truly desirous of something, perhaps being set on fire does not seem so bad."
Trying raising the master audio under your options, and lowering voice chat (if on console)
Is the rest of the sound working, like sound and skill effects? I play on PS4, so my experience is from that perspective, but all I did was lower the voice chat and raise master sound and ambient slightly when I first started.
Hope this helps you.
"If a person is truly desirous of something, perhaps being set on fire does not seem so bad."
Audio dialogue stopped working for me once before. I just restarted the game and it fixed it. Now what I get all the time is a big delay for the words to start. I'm ok with that because at least there is sound, but it does get frustrating sometimes.