Pensees by Blaise Pascal
Blaise Pascal's unfinished work, Pensées, is an eloquent apology for the Christian faith. In a fragmented collection of notes, Pascal examines Christianity as well as human nature through theological, sociological, and metaphysical lenses while experiencing his own religious conversion. Only through faith and God can mankind be saved from the wretched creatures they are since birth. This is a compelling read for everyone interested in religion.