"In the world of persons . . . instinct alone decides nothing. . . ."
Karol Cardinal Wojtyla (John Paul II), Love and responsibility, rev. ed., trans. H. T. Willetts (New York: Farrar, Straus, Giroux, 1981), 226, as quoted by Janet E. Smith in "Conscious parenthood," Nova et vetera: the English edition of the international theological journal 6, no. 4 (Fall 2008): 931. Smith points out that the phrase in Humanae Vitae 10 translated "responsible parenthood" is really "conscia paternitas" (946 ff.).