"Frankenstein" is a classic story in the horror genre of literature. This is especially interesting when it is discovered that it was the product of a contest between friends to out-do each other on a dare, but that is another story.
Victor Frankenstein began his unthinkable effort to create himself a "child" from the body parts of others with the intention of making something beautiful, something that would be a blessing to humanity. In gathering the pieces that he used he chose only parts that, in their original form on a living person, had been beautiful. Yet when his creature was animated it was nothing like what he had intended. He was horrified, disappointed and sorry that he ever set out on such a misguided project.
His feelings become evident in chapter five, when he says:
How can I describe my emotions at this catastrophe, or how delineate the wretch whom with such infinite pains and care I had endeavoured (sic) to form? His limbs were in proportion, and I had selected his features as beautiful. Beautiful! Great God!
In this quotation it becomes clear what his reason was. He couldn't face his failure.