“In the first papal encyclical co-written by two popes — one more conversational, the other more intellectual — Pope Francis on Friday issued a rich meditation on faith and love, calling on believers and seekers alike to explore how their lives could be enriched by God. […] In addition to citing the Old Testament and the Gospel, the text refers to Dante and the philosophers Jean-Jacques Rousseau and Friedrich Nietzsche; for the latter, faith was associated with darkness, not light. It also refers to T.S. Eliot and the Jewish philosopher Martin Buber’s exploration of idolatry. […]” –Rachel Donadio, The New York Times, July 5, 2013