If you don't want to know the circumstances surrounding Sunday's entry in this slideshow, then don't read any further...
[spoiler]Sunday's quote:
Ep #486 (1968) - Barnabas - 'We MUST not be emotional about his death, Julia. Every instinct, every feeling I have is to let go, to get revenge, but we MUST not, we have no time.'
From "#0485/0486: Robservations 05/16/02: Cassandra Wins Again"
Lab - Julia tells Barn Eric tried to tell her something important before dying: "If they both live, then, listen, listen," and then he lost consciousness. Julia hates this room, this experiment, it killed him as much as she did. If not for the secret, he'd have let her send for help. Barnabas tells Julia they can't be emotional about Eric's death; his every instinct tells him to let go, get revenge, but there is no time--the experiment will go on, as will Julia. While the body may have 48 hours, Barnabas isn't sure HE does--his vampirism is returning, all those urges--Eric's formula is less effective. She prepares the potion.
[/spoiler]
The Robservations paraphrases the quote but still references it well...