I should have known. I'm terribly sorry. I would never have spoken as I did.
5 seconds sound clip from the Isle of the Dead (1945) movie soundboard.
You can hear this line at 00:30:42.401 in the Blu-ray version of the movie.
Quote context
[...]
- I know. It's not an uncommon fear.
- Perhaps I have more reason for my fear than most.
- You see, since childhood I've been ill. I have fainting spells. Trances.
- Was it I who mentioned catalepsy yesterday?
- Yes. I couldn't tell you then.
- I should have known. I'm terribly sorry. I would never have spoken as I did.
- But you need not fear. I will take every precaution, make every known test if you are unlucky...
- Now that you understand, I'm no longer afraid.
- I suppose you want to hear my prayer to Hermes?
- I just came to see if your prayer would entertain me as much as my medicine seems to amuse you.
- O, God of physicians, God of healing, protect us. Watch over us, thou swift-footed one, son of Zeus.
[...]