In Christian theology, charity is considered one of the seven virtues and was understood by Thomas Aquinas as "the friendship of man for God", which "unites us to God". He holds it as "the most excellent of the virtues". Aquinas further holds that "the habit of charity extends not only to the love of God, but also to the love of our neighbor".

Deus caritas est, subtitled De Christiano Amore, is a 2005 encyclical, the first written by Pope Benedict XVI, in large part derived from writings by his late predecessor, Pope John Paul II. Its subject is love, as seen from a Christian perspective, and God's place within all love. Charity is one of the three theological virtues; and the other two were treated in two successive encyclicals, one signed by Benedict and one written substantially by him but signed by his successor Pope Francis . This text begins with a reflection on the forms of love known in Greek philosophy—eros, agape, philia (friendship)—and their relationship with the teachings of Jesus.