The framework of absolute Catholic theory employed by Greene … in his serious novels, really implies that sexuality is sinful and is not more than condoned by marriage. When Greene is writing about a real psychological situation he writes powerfully and movingly. Such a situation may well be one in which the particular actions of a character result from the reaction between a certain type of education and his concrete circumstances. This applies to the priest in The Power and the Glory. Compared with this the psychological situations of the policeman in The Heart of the Matter, and the novelist in The End of the Affair, seem factitious, even ad hoc.

To be artistically satisfying the situation must be objectively described. The author must not imply that, for esoteric reasons, he knows more about the answers to the problem than the characters do. You can write a human book...