The transmission of human life is a most serious role in which married people collaborate freely and responsibly with God the Creator. It has always … - Paul VI

We find sin the perversion of human freedom, and the deep cause of death, because it is separation from God, the source of life...and then, in its turn, the occasion and effect of an intervention in us and in our world of an obscure agent, the Devil. Evil is not merely a lack of something, but an effective agent, a living spiritual being, perverted and perverting. A terrible reality. Mysterious and frightening. It is contrary to the teaching of the Bible and the Church to refuse to recognize the existence of such a reality, or to regard it as a principle in itself which does not draw its origin from God like every other creature; or to explain it as a pseudoreality, a conceptual and fanciful personification of the unknown causes of our misfortunes.

Sacro autem baptismate ablutis, matrimonium eiusmodi praeditum est dignitate, ut gratiae sacramentale signum exsistat, cum Christi et Ecclesiae coniunctionem designet.

With regard to man's innate drives and emotions, responsible parenthood means that man's reason and will must exert control over them.