“Their own strength has betrayed them. They have…pulled down Deep Heaven on their heads.”
Clive Staples Lewis book That Hideous Strength
Source: That Hideous Strength (1945), Ch. 13 : They Have Pulled Down Deep Heaven on Their Heads

That Hideous Strength is a 1945 novel by C. S. Lewis, the final book in Lewis's theological science fiction Space Trilogy. The events of this novel follow those of Out of the Silent Planet and Perelandra and once again feature the philologist Elwin Ransom. Yet unlike the principal events of those two novels, the story takes place on Earth rather than in space or on other planets in the solar system. The story involves an ostensibly scientific institute, the N.I.C.E., which is a front for sinister supernatural forces.
“Their own strength has betrayed them. They have…pulled down Deep Heaven on their heads.”
Clive Staples Lewis book That Hideous Strength
Source: That Hideous Strength (1945), Ch. 13 : They Have Pulled Down Deep Heaven on Their Heads
Clive Staples Lewis book That Hideous Strength
Source: That Hideous Strength (1945), Ch. 7 : The Pendragon, section 2
Clive Staples Lewis book That Hideous Strength
Source: That Hideous Strength (1945), Ch. 16 : Banquet at Belbury, section 6
Clive Staples Lewis book That Hideous Strength
There is consequently a phatic hiatus."
Source: That Hideous Strength (1945), Ch. 8 : Moonlight at Belbury, section 2
“They have an engine called the Press whereby the people are deceived.”
Clive Staples Lewis book That Hideous Strength
Source: That Hideous Strength (1945), Ch. 13 : They Have Pulled Down Deep Heaven on Their Heads