If you don't want to know the circumstances surrounding Tuesday's entry in this slideshow, then don't read any further...
[spoiler]Tuesday's quote:
Ep #630 (1968) - Nicholas - 'And whatever stops her, it MUST be arranged so that it can never be traced to me. Never.'
From "Robservations 9/4/02 - #630/631 - Barnabas & Vicki Try to Reason With Nick"
I am giving you the chance to break off with her before I go to see Maggie, she says. I think you recognize honesty and love, he says, and I can't stop you going to Maggie, but after you finish talking to me, Maggie will come to me, and I will make her forget what you said---without using any powers. He helps her into her coat and bids her good night. Vicki tells him she isn't going to see Maggie yet--if Nicholas truly loves her, he will think about it, and will see it is impossible. After the leaves, he furiously smashes something into the fireplace, saying that it would have been that easy--she could have left and not remembered even coming here! Why didn't he do it? Maggie Evans, he says, makes me human--but Vicki can never be allowed to go to Maggie!--whatever stops her must be arranged so it can never be traced to him, never. But there IS a way. He has depended on his own powers for so long, he forgot--there is another way! He races from the room and down into the basement. He counts the flagstones and begins to pry one of them up with a crowbar.
[/spoiler]
The Robservations references the quote almost perfectly - again, just a switch of one pronoun...