If you don't want to know the circumstances surrounding Monday's entry in this slideshow, then don't read any further...
[spoiler]Monday's quote:
Ep #1121 (1840) - Barnabas - 'I MUST congratulate you, Mr. Stiles.'
From "#1121/1122: Robservations 09/25/03: A Sticky Domestic Situation"
Barnabas enters and Gerard asks if he saw anyone on his way over here--Samantha thought she saw someone through the window, that's all. Barnabas congratulates him, but Gerard says congratulations are a bit premature, and he doesn't wish to discuss it any further. Of course, says Barnabas, and joins Gerard in the drawing room
[/spoiler]
The Robservations references the circumstances of the quote well...
And this is the third quote from this ep. The first (Quentin - 'You married Gerard. You MUST have a feeling for him') was back on May 11th of 2021, and the second (Samantha - 'There MUST have been some way you could have let us know') was back on February 15th of 2022.