The Private Memoirs and Confessions of a Justified Sinner

The Private Memoirs and Confessions of a Justified Sinner: Written by Himself: With a detail of curious traditionary facts and other evidence by the editor is a novel by the Scottish author James Hogg, published anonymously in 1824. The plot concerns Robert Wringhim, a staunch Calvinist who, under the influence of the mysterious Gil-Martin, believes he is guaranteed Salvation and justified in killing those he believes are already damned by God.

Source: Wikipedia — The Private Memoirs and Confessions of a Justified Sinner (CC BY-SA 4.0)