The Church has always pointed out that a person’s conscience can err: it “is not an infallible judge” (62.3). Hence we need to make the laborious (but fruitful) effort to form our conscience: “to make it the object of a continuous conversion to what is true and to what is good” (64.1). (Also see Dominum et Vivificantem, nos. 42–45 on the Holy Spirit as the “light of consciences” and “laborious effort of conscience” necessary to discover and follow God’s Law.) Pope John Paul reminds us of the title