From Pope Benedict XVI’s encyclical Caritas in Veritate (2009):
In this context, the theme of integral human development takes on an even broader range of meanings: the correlation between its multiple elements requires a commitment to foster the interaction of the different levels of human knowledge in order to promote the authentic development of peoples. Often it is thought that development, or the socio-economic measures that go with it, merely require to be implemented through joint action. This joint action, however, needs to be given direction, because “all social action involves a doctrine.”74 In view of the complexity of the issues, it is obvious that the various disciplines have to work together through an orderly interdisciplinary exchange. Charity does not exclude knowledge, but rather requires, promotes, and animates it from within. Knowledge is never purely the work of the intellect. It can certainly be reduced to calculation and experiment, but if it aspires to be wisdom capable of directing man in the light of his first beginnings and his final ends, it must be “seasoned” with the “salt” of charity. Deeds without knowledge are blind, and knowledge without love is sterile. Indeed, “the individual who is animated by true charity labours skilfully to discover the causes of misery, to find the means to combat it, to overcome it resolutely.”75 Faced with the phenomena that lie before us, charity in truth requires first of all that we know and understand, acknowledging and respecting the specific competence of every level of knowledge. Charity is not an added extra, like an appendix to work already concluded in each of the various disciplines: it engages them in dialogue from the very beginning. The demands of love do not contradict those of reason. Human knowledge is insufficient and the conclusions of science cannot indicate by themselves the path towards integral human development. There is always a need to push further ahead: this is what is required by charity in truth.76 Going beyond, however, never means prescinding from the conclusions of reason, nor contradicting its results. Intelligence and love are not in separate compartments: love is rich in intelligence and intelligence is full of love.
74 Paul VI, Encyclical Letter Populorum Progressio, 39: Acta Apostolicæ Sedis [AAS] 59 (1967), 276-277.
75 Ibid., 75: loc. cit., 293-294.
76 Cf. Benedict XVI, Encyclical Letter Deus Caritas Est, 28: AAS 98 (2006), 238-240.
— Caritas in Veritate 30