The Jansenists never declined.
They got wiped out good.
Think "End of the Line" by the Traveling Wilburys.
Pascal enters and exits, assisted by Roberto Rossellini's tv show (1971) and Jack Kerouac's bar game (1969).
The 'Sun King' plays his cruel part, while Our Ladies of Port-Royal
hold the line.
They really hold the line!
As Sainte-Beuve wrote of the Jansenists,
"They were from Calvary".