"Eons and unimaginable eons ago, before mankind existed on earth, only the waters existed. There was no land. And from the slime there sprang up a race of beings which dwelt in the sunken abysses of the ocean, inhuman creatures that worshipped Dagon, their god. When eventually the waters receded and great continents arose, these beings were driven down to the lowest depths. Their mighty kingdom, that had once stretched from pole to pole, was shrunken as the huge land masses lifted. Mankind came — but from whence I do not know — and civilizations arose. … These things hate man, for they feel that man has usurped their kingdom. Their greatest hope is to sink the continents again, so that the seas will roll over all the earth, and not a human being will survive. Their power will embrace the whole world, as it once did eons ago. They are not human, you see, and they worship Dagon. They want no other gods worshipped on Earth. Ishtar, dark Eblis, even Poseidon of the sunlit seas. . . ."

“They dare'd not invade the palace while the globe shone, for the light-rays would have killed them. … This island-continent would have gone down beneath the sea long ago if I hadn't pitted my magic and my science against that of the children of Dagon. They are masters of the earthquake, and Atlantis rests on none too solid a foundation. Their power is sufficient to sink Atlantis forever beneath the sea. But within that room" — Zend nodded toward the curtain that hid the sea-bred horrors — "in that room there is power far stronger than theirs. I have drawn strength from the stars, and the cosmic sources beyond the universe. You know nothing of my power. It is enough — more than enough — to keep Atlantis steady on its foundation, impregnable against the attacks of Dagon's breed. They have destroyed other lands before Atlantis.”

“The words. I couldn’t understand the words. The only means of communication, and they are a deadly barrier.”

“The wars ended when there were no longer two societies left to fight against each other.”

“Then I knew that the last test of sanity had failed me, for it was no longer possible to tell the unreal from the real. The last test fails when the illusion moves into life itself and you can touch and feel and handle the commercial vision as if she were the real woman. There was no defense any more.”

“All these things were slipping away from him, in a clear, cold wisdom that came from beyond the stars. He envisioned man as a bit of animate clay moving fro a little while upon a ball of mud and stone and water that drifted through the void, through the darkness that would finally engulf it.”

“Henry Kuttner profile at Fantastic Fiction”