Dulce et Decorum Est
How we cite our quotes:
"If you could hear, at every jolt, the blood
Come gargling from the froth-corrupted lungs,
Obscene as cancer, bitter as the cud
Of vile, incurable sores on innocent tongues,—" (21-24)
The intense imagery of these lines emphasizes how unimaginable such horrors are for the civilian population. No one can understand how excruciating it is to die of gas poisoning, unless, of course, you're watching your comrades choke on their own blood.