“I have always held the old-fashioned opinion that the primary object of a work of fiction should be to tell a story; and I have never believed that the novelist who properly performed this first condition of his art, was in danger, on that account, of neglecting the delineation of character — for this plain reason, that the effect produced, by any narrative of events is essentially dependent, not on the events themselves, but on the human interest which is directly connected with them. It may be possible in novel-writing to present characters successfully without telling a story; but it is not possible to tell a story successfully without presenting characters: their existence, as recognizable realities, being the sole condition on which the story can be effectively told. The only narrative which can hope to lay a strong hold on the attention of readers is a narrative which interests them about men and women — for the perfectly obvious reasons that they are men and women themselves.”

Source: Collins explaining what he calls the literary principal guiding him, in the preface of the second edition of The Woman in White. Also in Reality's Dark Light: The Sensational Wilkie Collins by Maria K. Bachman & Don Richard Cox [University of Tennessee Press, 2003, ISBN 1-572-33274-3] ( p. xiv https://books.google.com/books?id=_X8AlmIp0dwC&pg=PR14)