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"One day, when I was oppressed by cold, I found a fire which had been left by some wandering beggars, and was overcome with delight at the warmth I experienced from it. In my joy I thrust my hand into the live embers, but quickly drew it out again with a cry of pain."
Frankenstein puts his hand into the fire then pulls it out.
Obviously, Frankenstein which is not the doctor but the creature experience is that he doesn't want to do it again