Defoe was an elderly man when he turned novelist, many years the predecessor of Richardson and Fielding, and one of the first indeed to shape the novel and launch it on its way. But it is unnecessary to labour the fact of his precedence, except that he came to his novel-writing with certain conceptions about the art which he derived partly from being himself one of the first to practise it. The novel had to justify its existence by telling a true story and preaching a sound moral. "This supplying a story by invention is certainly a most scandalous crime," he wrote. "It is a sort of lying that makes a great hole in the heart, in which by degrees a habit of lying enters in."