From the encyclical, Deus Caritas Est, #30 b:
Church agencies, with their transparent operation and their faithfulness to the duty of witnessing to love, are able to give a Christian quality to the civil agencies too, favouring a mutual coordination that can only redound to the effectiveness of charitable service.
Numerous organizations for charitable or philanthropic purposes have also been established and these are committed to achieving adequate humanitarian solutions to the social and political problems of the day. Significantly, our time has also seen the growth and spread of different kinds of volunteer work, which assume responsibility for providing a variety of services. I wish here to offer a special word of gratitude and appreciation to all those who take part in these activities in whatever way. For young people, this widespread involvement constitutes a school of life which offers them a formation in solidarity and in readiness to offer others not simply material aid but their very selves. The anti-culture of death, which finds expression for example in drug use, is thus countered by an unselfish love which shows itself to be a culture of life by the very willingness to “lose itself” (cf. Lk 17:33 et passim) for others.