Sewell was raised in a Quaker family, where she was surrounded by strict religious beliefs. She taught classes to working-class men and participated in charitable work. Her mother's writings of evangelical books for children shaped Sewell's strong views on proper behavior. Sewell embodied traditional Victorian values, focusing on morality, hard work, self-denial, and charity. These principles are prominently featured throughout Black Beauty. Consequently, Sewell’s novel is regarded not only as a guide for the humane treatment of horses but also as a reflection on appropriate human conduct. The teachings from characters like Duchess to Beauty, coachman John Manly, and cab driver Jerry Barker are purposefully included to enlighten the reader. For example, Duchess imparts the value of doing one's best and working diligently; John Manly stresses the importance of kindness and leading by example; Jerry Barker demonstrates integrity, helping those in need, and prioritizing family. Additionally, characters like Squire Gordon underscore Sewell’s main theme: the necessity of kindness toward animals. Sewell also vehemently criticizes the dangers of alcohol throughout the story. The groom who injures Beauty's knees is intoxicated during the incident. Many characters who mistreat horses are often portrayed as drunk. Cab drivers are frequently shown squandering time and money on drinking. Even the otherwise kind-hearted Governor Grant struggles with alcohol and seeks Jerry’s advice on quitting. Sewell, a fervent advocate for temperance, uses Black Beauty to express her views on this moral issue, among others.