19th century England had serious social problems from the heyday of Royalty and Nobility. One of the most significant of these was the tendency to marry for money. A person sought a partner based on the dowry receivable and their allowance. This process went both ways: a beautiful woman might be able to snag a rich husband, or a charring and handsome man could woo a rich young girl. In these marriages, money was the only consideration. Love was left out, with the thought that it would develop as the years went by. In Pride and Prejudice, Jane Austen comments...
formed without love.

In conclusion, the essential statement made about marriage in Pride and Prejudice is that a marriage for money will end up unsuccessful. At the same time, a marriage based purely on the means of passion and love alone will also be doomed to failure. A balance must be met. Balance doesn't necessarily have to be equal, but must be present in order for a marriage to be successful. This is proven in the novel Pride and Prejudice, by examples of unsuccessful marriages formed for money, and successful marriages formed by a combination of love and security.