“It remains a sad truth of the Imperium that virtually no veteran ever comes back from fighting its wars intact. Combat alone shreds nerves and shatters bodies. But the horrors of the warp, and of foul xenos forms like the tyranid, steal sanity forever, and leave veterans fearing the shadows, and the night and, sometimes, the nature of their friends and neighbours, for the rest of their lives.”

“It remains a sad truth of the Imperium that virtually no veteran ever comes back from fighting its wars intact. Combat alone shreds nerves and shatters bodies. But the horrors of the warp, and of foul xenos forms like the tyranid, steal sanity forever, and leave veterans fearing the shadows, and the night and, sometimes, the nature of their friends and neighbours, for the rest of their lives.”

— Dan Abnett