If you don't want to know the circumstances surrounding Saturday's entry in this slideshow, then don't read any further...
[spoiler]Saturday's quote:
Ep #485 (1968) - Barnabas - 'It will work, Willie, because it MUST.'
From "#0485/0486: Robservations 05/16/02: Cassandra Wins Again"
Barnabas seals the envelope as Willie worries things won't be the same; suppose they won't let Adam live there, what will happen to him? Trust me, Willie, says Barn, things are changed at Collinwood--make sure only Liz gets that letter. Willie asks if Barnabas will see him before he leaves. Very likely not, says Barn. He assures the anxious Willie he'll recognize him upon his return, being deliberately unsentimental--even in the other body, he'll know who he is--I promise.Willie is still sure it won't work, and as the dogs continue to howl, Barnabas tells him it will work--because it must! Willie leaves with the letter.
[/spoiler]
With the exception of Barnabas addressing Willie by name, the Robservations references the quote perfectly...
And this is the second quote from this ep. The first (Dr. Lang - 'I MUST... I MUST get back to work') was back on January 28th of 2022, exactly a year earlier.