Throughout the novel, Winston has been looking forward to "the place where there is no darkness" as a refuge from the distortion, hatred and suspicion under which everyone lives in Oceania.
It is revealed when they are all arrested and taken to a brightly lit antiseptic looking metal room--cold, uncomfy, and never dark. Certainly not a refuge.
Ampleforth is arrested for his inability to remove the word "God" from a line of poetry. Parsons is arrested for thoughtcrime and had been turned in by his own daughter.
These two men are arrested for seemingly innocent things. Ampleforth was simply trying to keep the rhyme scheme in Kipling's poem true, and Parsons claims to be proud of the daughter who accused him of thoughtcrime--something he says must have come upon him without his knowledge whatsoever.
No one is safe...there is no security in Oceania within the Party.