Frankenstein

I'm sorry, I assume you are referring to Chapter Fifteen. Unfortunately, the first paragraph of the chapter does not address the creature's decision to approach De Lacey.

“Such was the history of my beloved cottagers. It impressed me deeply. I learned, from the views of social life which it developed, to admire their virtues and to deprecate the vices of mankind. (Chapter Fifteen, Paragraph One)

Later in the chapter, we learn......

“The winter advanced, and an entire revolution of the seasons had taken place since I awoke into life. My attention at this time was solely directed towards my plan of introducing myself into the cottage of my protectors. I revolved many projects, but that on which I finally fixed was to enter the dwelling when the blind old man should be alone. I had sagacity enough to discover that the unnatural hideousness of my person was the chief object of horror with those who had formerly beheld me. My voice, although harsh, had nothing terrible in it; I thought, therefore, that if in the absence of his children I could gain the good will and mediation of the old De Lacey, I might by his means be tolerated by my younger protectors.