“Satan had his companions, fellows devils, to admire and encourage him, but I am solitary and abhorred.”
Quite possibly the most important theme pertaining to Frankenstein’s creature, companionship and understanding are displayed full force when the Creature discusses his need to be accepted by another being. Frankenstein’s abandonment and disgust at his own creation deeply affected how the Creature emotionally developed. His only desire in life was to understand why his master hated him so much and to find someone to accept him. In his desire for a companion, he feels anger when others refuse to accept him and when his creator refuses to build him a companion. Had Frankenstein acknowledged the Creatures basic “human” need for companionship, he may have avoided much of the misery that occurred later in his life, like the murder of his wife and best friend or the death of his father.
EDIT: Shelley references Satan in this passage to show that even the most hated and feared creature in the world has companions, but he (the Creature) still has no friendship.