Mater et Magistra §42

⁴² In that broadcast message the great Pontiff claimed for the Church "the indisputable competence" to "decide whether the bases of a given social system are in accord with the unchangeable order which God our Creator and Redeemer has shown us through the Natural Law and Revelation." (l8) He confirmed the perennial validity and inexhaustible worth of the teaching of Rerum Novarum , and took occasion "to give some further directive moral principles on three fundamental values of social and economic life. These three fundamental values, which are closely connected one with the other, mutually complementary and dependent, are: the use of material goods, work, and the family." (19)