Each time I dip a living creature into the bath of burning pain, I say, ‘This time I will burn out all the animal; this time I will make a rational creature of my own!’ After all, what is ten years? Men have been a hundred thousand in the making.” He thought darkly. “But I am drawing near the fastness. This puma of mine⁠—” After a silence, “And they revert. As soon as my hand is taken from them the beast begins to creep back, begins to assert itself again.” Another long silence.

“Then you take the things you make into those dens?” said I.