Read it through once

No sooner did I see that his attention was riveted on them, and that I might gaze without being observed, than my eyes were drawn involuntarily to his face; I could not keep their lids under control: they would rise, and the irids would fix on him. I looked, and had an acute pleasure in looking,—a precious yet poignant pleasure; pure gold, with a steely point of agony: a pleasure like what the thirst-perishing man might feel who knows the well to which he has crept is poisoned, yet stoops and drinks divine draughts nevertheless.