Graham Greene is an author you should be familiar with.
“Graham Greene is perhaps the most perplexing of all the literary converts whose works animated the Catholic literary revival in the 20th century. His visions of angst and guilt, informed and sometimes deformed by a deeply felt religious sensibility, make his novels, and the characters that adorn them, both fascinating and unforgettable.” (Joseph Pearce)
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2. Consider your character’s spiritual life.