Charity is love received and given. It is “grace” (cháris). Its source is the wellspring of the Father's love for the Son, in the Holy Spirit. Love comes down to us from the Son. It is creative love, through which we have our being; it is redemptive love, through which we are recreated. Love is revealed and made present by Christ (cf. Jn 13:1) and “poured into our hearts through the Holy Spirit” (Rom 5:5). As the objects of God's love, men and women become subjects of charity, they are called to make themselves instruments of grace, so as to pour forth God's charity and to weave networks of charity.
This dynamic of charity received and given is what gives rise to the Church's social teaching, which is caritas in veritate in re sociali: the proclamation of the truth of Christ's love in society. This doctrine is a service to charity, but its locus is truth. Truth preserves and expresses charity's power to liberate in the ever-changing events of history. It is at the same time the truth of faith and of reason, both in the distinction and also in the convergence of those two cognitive fields. Development, social well-being, the search for a satisfactory solution to the grave socio-economic problems besetting humanity, all need this truth. What they need even more is that this truth should be loved and demonstrated. Without truth, without trust and love for what is true, there is no social conscience and responsibility, and social action ends up serving private interests and the logic of power, resulting in social fragmentation, especially in a globalized society at difficult times like the present.
---Benedict XVI, Caritas in veritate, ("Love in Truth"), his third encyclical, from paragraph 5, (2009).