A novelist is an author or writer of novels, though often novelists also write in other genres of both fiction and non-fiction. Some novelists are professional novelists, thus make a living writing novels and other fiction, while others aspire to support themselves in this way or write as an avocation. Most novelists struggle to get their debut novel published, but once published they often continue to be published, although very few become literary celebrities, thus gaining prestige or a considerable income from their work. Novelists come from a variety of backgrounds and social classes, and frequently this shapes the content of their works. Public reception of a novelist's work, the literary criticism commenting on it, and the novelists' incorporation of their own experiences into works and characters can lead to the author's personal life and identity being associated with a novel's fictional content. For this reason, the environment within which a novelist works and the reception of their novels by both the public and publishers can be influenced by their demographics or identity; important among these culturally constructed identities are gender, sexual identity, social class, race or ethnicity, nationality, religion, and an association with place. Similarly, some novelists have creative identities derived from their focus on different genres of fiction, such as crime, romance or historical novels. While many novelists compose fiction to satisfy personal desires, novelists and commentators often ascribe a particular social responsibility or role to novel writers. Many authors use such moral imperatives to justify different approaches to novel writing, including activism or different approaches to representing reality "truthfully".