Some important excerpts,
(source: Second Vatican Council, Pastoral Constitution on the Church in the World of Today, no. 50: AAS 58 (1966), 1070-1072 [TPS XI, 292-293].)
It is a love which is total—that very special form of personal friendship in which husband and wife generously share everything, allowing no unreasonable exceptions and not thinking solely of their own convenience. Whoever really loves his partner loves not only for what he receives, but loves that partner for the partner's own sake, content to be able to enrich the other with the gift of himself.Married love is also faithful and exclusive of all other, and this until death. This is how husband and wife understood it on the day on which, fully aware of what they were doing, they freely vowed themselves to one another in marriage. Though this fidelity of husband and wife sometimes presents difficulties, no one has the right to assert that it is impossible; it is, on the contrary, always honorable and meritorious. The example of countless married couples proves not only that fidelity is in accord with the nature of marriage, but also that it is the source of profound and enduring happiness.
Finally, this love is fecund. It is not confined wholly to the loving interchange of husband and wife; it also contrives to go beyond this to bring new life into being. "Marriage and conjugal love are by their nature ordained toward the procreation and education of children. Children are really the supreme gift of marriage and contribute in the highest degree to their parents' welfare."
(source #1: See Council of Trent Roman Catechism, Part II, ch. 8; Pius XI, encyc. letter Casti connubii: AAS 22 (1930), 562-564; Pius XII, Address to Medico-Biological Union of St. Luke: Discorsi e radiomessaggi, VI, 191-192; Address to Midwives: AAS 43 (1951), 842-843; Address to Family Campaign and other family associations: AAS 43 (1951), 857-859; John XXIII, encyc. letter Pacem in terris: AAS 55 (1963), 259-260 [TPS IX, 15-16]; Second Vatican Council, Pastoral Constitution on the Church in the World of Today, no. 51: AAS 58 (1966), 1072 [TPS XI, 293].
Therefore We base Our words on the first principles of a human and Christian doctrine of marriage when We are obliged once more to declare that the direct interruption of the generative process already begun and, above all, all direct abortion, even for therapeutic reasons, are to be absolutely excluded as lawful means of regulating the number of children. Equally to be condemned, as the magisterium of the Church has affirmed on many occasions, is direct sterilization, whether of the man or of the woman, whether permanent or temporary.Similarly excluded is any action which either before, at the moment of, or after sexual intercourse, is specifically intended to prevent procreation—whether as an end or as a means
Neither is it valid to argue, as a justification for sexual intercourse which is deliberately contraceptive, that a lesser evil is to be preferred to a greater one, or that such intercourse would merge with procreative acts of past and future to form a single entity, and so be qualified by exactly the same moral goodness as these. Though it is true that sometimes it is lawful to tolerate a lesser moral evil in order to avoid a greater evil or in order to promote a greater good," it is never lawful, even for the gravest reasons, to do evil that good may come of it—in other words, to intend directly something which of its very nature contradicts the moral order, and which must therefore be judged unworthy of man, even though the intention is to protect or promote the welfare of an individual, of a family or of society in general. Consequently, it is a serious error to think that a whole married life of otherwise normal relations can justify sexual intercourse which is deliberately contraceptive and so intrinsically wrong.
source #2: See Pius XI, encyc. letter Casti connubii: AAS 22 (1930), 565; Decree of the Holy Office, Feb. 22, 1940: AAS 32 (1940), 73; Pius XII, Address to Midwives: AAS 43
(1951), 843-844; to the Society of Hematology: AAS 50 (1958), 734-735 [TPS VI, 394-395].
source #3: See Council of Trent Roman Catechism, Part II, ch. 8; Pius XI, encyc. letter Casti connubii: AAS 22 (1930), 559-561; Pius XII, Address to Midwives: AAS 43 (1951), 843; to the Society of Hematology: AAS 50 (1958), 734-735 [TPS VI, 394-395]; John XXIII, encyc.letter Mater et Magistra: AAS 53 (1961), 447 [TPS VII, 331].)
Consequently, unless we are willing that the responsibility of procreating life should be left to the arbitrary decision of men, we must accept that there are certain limits, beyond which it is wrong to go, to the power of man over his own body and its natural functions—limits, let it be said, which no one, whether as a private individual or as a public authority, can lawfully exceed. These limits are expressly imposed because of the reverence due to the whole human organism and its natural functions, in the light of the principles We stated earlier, and in accordance with a correct understanding of the "principle of totality" enunciated by Our predecessor Pope Pius XII.(source: See Pius XII, Address to Association of Urology: AAS 45 (1953), 674-675; to leaders and members of Italian Association of Cornea Donors and Italian Association for the Blind: AAS 48 (1956), 461-462 [TPS III, 200-201].)
Finally, I am going to post this....
And now We wish to speak to rulers of nations. To you most of all is committed the responsibility of safeguarding the common good. You can contribute so much to the preservation of morals. We beg of you, never allow the morals of your peoples to be undermined. The family is the primary unit in the state; do not tolerate any legislation which would introduce into the family those practices which are opposed to the natural law of God. For there are other ways by which a government can and should solve the population problem—that is to say by enacting laws which will assist families and by educating the people wisely so that the moral law and the freedom of the citizens are both safeguarded.
Obama and other leaders of the world would do well to read this paragraph and take it to heart! Obama does have the responsibility of safeguarding the common good. Obama must STOP undermining the preservation of morals. Obama is not only tolerating, but promoting legislation which is contrary to Natural Law. If there is a problem with population, which I don't believe there ever has been in the USA, the answer is promoting chastity in married life, as well as in single life.
If we do a study on unmarried birth rates since 1968 as opposed to married birth rates, I think that we'll find that chastity in general was under attack and that the focus was too narrow. I think that a re-affirmation of chastity is warranted and should be made by the current Holy Father.
Michael Voris is right...and so are those of us who have been on this issue.