The unnatural position used in crucifixion made every movement painful; the lacerated veins and crushed tendons throbbed with incessant anguish; the wounds, inflamed by exposure, gradually gangrened; the arteries—especially at the head and stomach—became swollen and oppressed with surcharged blood; and while each variety of misery went on gradually increasing, there was added to them the intolerable pang of a burning and raging thirst; and all these physical complications caused an internal excitement and anxiety, which made the prospect of death itself—of death, the unknown enemy, at whose approach man usually shudders most—bear the aspect of a delicious and exquisite release.
Baker Books, 1500 Illustrations for Biblical Preaching, by Michael P. Green