Why is Darcy attracted to Elizabeth? What does this reveal about his character traits?

Darcy's inordinate pride is based on his extreme class-consciousness. Yet eventually he sees that factors other than wealth determine who truly belongs in the aristocracy. In turn Mr. Darcy shows Elizabeth that her judgments were often rash if not wrong and she realizes that they were based on vanity, not on reason. it becomes equally clear that Darcy, through Elizabeth's genius for treating all people with respect for their natural dignity, is reminded that institutions are not an end in themselves but are intended to serve the end of human happiness.