Theological virtues are virtues associated in Christian theology and philosophy with salvation resulting from the grace of God. Virtues are traits or qualities which dispose one to conduct oneself in a morally good manner. Traditionally they have been named Faith, Hope, and Charity, and can trace their importance in Christian theology to Paul the Apostle in 1 Corinthians 13, who also pointed out that "the greatest of these is love."
The medieval Catholic philosopher Thomas Aquinas explained that these virtues are called theological virtues "because they have God for their object, both in so far as by them we are properly directed to Him, and because they are infused into our souls by God alone, as also, finally, because we come to know of them only by Divine revelation in the Sacred Scriptures".
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The first mention in Christian literature of the three theological virtues is in St. Paul's first letter to the Thessalonians 1:3, "...calling to mind your work of faith and labor of love and endurance in hope..." In 1 Thessalonians 5:8, he refers to this triad of virtues again, "But since we are of the day, let us be sober, putting on the breastplate of faith and love and the helmet that is hope for salvation."
In 1 Corinthians 13, Paul places the greater emphasis on Charity (Love). "So faith, hope, love remain, these three; but the greatest of these is love." First, because it informs the other two: "It bears all things, believes all things, hopes all things, endures all things." According to Augustine of Hippo, from a temporal perspective, love lasts, while "Hope isn't hope if its object is seen", and faith gives way to possession. This view is shared by Gregory of Nyssa.
Aquinas found an interconnection of practical wisdom (prudentia) and moral virtue (e.g. courage without prudence risks becoming mere foolhardiness). This is frequently termed "the Unity of the Virtues."
Aquinas stated that theological virtues are so called "because they have God for their object, both in so far as by them we are properly directed to Him, and because they are infused into our souls by God alone, as also, finally, because we come to know of them only by Divine revelation in the Sacred Scriptures".
In his treatment of the virtues, Aquinas viewed the theological virtues as being the product of habitual grace. According to Aquinas, this grace, through the theological virtues, allows humanity to become agents in meritorious action that is beyond their own natural ability. In this way it is supernatural.
Aquinas says "Faith has the character of a virtue, not because of the things it believes, for faith is of things that appear not, but because it adheres to the testimony of one in whom truth is infallibly found". (De Veritate, xiv, 8)
Aquinas further connected the theological virtues with the cardinal virtues. He views the supernatural inclinations of the theological virtues, caused by habitual grace, to find their fulfillment in being acted upon in the cardinal virtues.
The moral virtues are acquired by practice and habit. Catholic moral theology holds that the theological virtues differ from the cardinal virtues in that they cannot be obtained by human effort, but are infused by God into a person. Like the cardinal virtues, an individual who exercises these virtues strengthens and increases them, i.e., they are more disposed to practice them.
Following St. Augustine, Aquinas also recognized a separate but related type of moral virtue which is also infused by God. The distinction lies both in their source and end. The moral virtue of temperance recognizes food as a good that sustains life, but guards against the sin of gluttony. The infused virtue of temperance disposes the individual to practice fasting and abstinence. The infused moral virtues are connected to the theological virtue of Charity.
Pope Benedict XVI wrote three encyclicals about the theological virtues: Deus caritas est (about love), Spe salvi (about hope), and Lumen fidei (about faith: this encyclical was written both by Pope Benedict XVI and by Pope Francis).