I think that Victor Frankenstein’s reactions to his creation as it comes to life epitomize his instant regrets at his attempts to play God. These quotations come from Chapter 5.
How can I describe my emotions at this catastrophe, or how delineate the wretch whom with such infinite pains and care I had endeavoured to form?
Here Victor reveals his emotion on the act of being able to imbue life as a ‘catastrophe’ – a disaster, and his creation is at first indescribable in its ugliness. He goes on-
but now that I had finished, the beauty of the dream vanished, and breathless horror and disgust filled my heart.
Victor explains that in the instant the creature’s life begins, the drive he had for the previous two years to celebrate his genius evaporates into revulsion. Victor flees from the creature, which follows him in search of company. As it peers into his bedchamber, Victor says –
I beheld the wretch -- the miserable monster whom I had created.
He has no affection for his creation, and cannot even show civility to its confused form. His disgust at its appearance is palpable-
Oh! no mortal could support the horror of that countenance. A mummy again endued with animation could not be so hideous as that wretch. I had gazed on him while unfinished; he was ugly then; but when those muscles and joints were rendered capable of motion, it became a thing such as even Dante could not have conceived.