The Catholic Church bases her teaching upon one source: The word of God. This divine revelation is transmitted in two ways: through Scripture and apostolic tradition. Many assume that only the writings of the apostles are the word of God. However, their oral transmission of the faith is also considered the word of God (1 Thess. 2:13). Few Protestant groups today accept the validity, let alone the authority, of tradition. In fact, many believe that Scripture is the only definitive source of divine truth.
"No work of charity should be regarded as foreign to the Society, although its special object is to visit poor families."
~ In outlining the activities of The Society of Saint Vincent de Paul, an international association of Catholic laymen engaging systematically in personal service to the poor, the founders had an eye to the future needs of human kind.