CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 906–909

906 Lay people who are capable and trained may also collaborate in catechetical formation, in teaching the sacred sciences, and in use of the communications media.
907 "In accord with the knowledge, competence, and preeminence which they possess, [lay people] have the right and even at times a duty to manifest to the sacred pastors their opinion on matters which pertain to the good of the Church, and they have a right to make their opinion known to the other Christian faithful, with due regard to the integrity of faith and morals and reverence toward their pastors, and with consideration for the common good and the dignity of persons."
908 By his obedience unto death, Christ communicated to his disciples the gift of royal freedom, so that they might "by the self-abnegation of a holy life, overcome the reign of sin in themselves":

That man is rightly called a king who makes his own body an obedient subject and, by governing himself with suitable rigor, refuses to let his passions breed rebellion in his soul, for he exercises a kind of royal power over himself. And because he knows how to rule his own person as king, so too does he sit as its judge. He will not let himself be imprisoned by sin, or thrown headlong into wickedness.

909 "Moreover, by uniting their forces let the laity so remedy the institutions and conditions of the world when the latter are an inducement to sin, that these may be conformed to the norms of justice, favoring rather than hindering the practice of virtue. By so doing they will impregnate culture and human works with a moral value."