In the words of this Document Christians should 'penetrate the world with a Christian spirit and be witnesses to Christ in all things in the midst of human society'. This is a call to every one of us, wherever we are, whatever our occupation, whether in the office, the shop floor, at home or at school. Here are proposals which concern every aspect of our lives: married and family life, private and public spending, polictical responsiblity, war, international relations. We must seek how to best to implement them.