From
Wikipedia:
An encyclical was originally a circular letter sent to all the churches of a particular area in the ancient Christian church. At that time, the word could be used for a letter sent out by any bishop. The word comes from Latin encyclia (from the Greek “en kyklo, ἐν κύκλῳ”) meaning “general” or “encircling”, which is also the origin of the word “encyclopedia”.
For the modern Roman Catholic Church a Papal encyclical, in the strictest sense, is a letter, usually treating some aspect of Catholic doctrine, sent by the Pope and addressed either to the Catholic bishops of a particular area or, more normally, to the bishops of the world; however, the form of the address can vary widely, and often designates a wider audience. Papal encyclicals usually take the form of a Papal brief due to their more personal nature as opposed to the formal Papal bull. Papal encyclicals are so famous that the term encyclical is used almost exclusively for those sent out by the Pope. The title of the encyclical is usually taken from its first few words.
Within Catholicism in recent times, an encyclical is generally used for significant issues, and is second in importance only to the highest ranking document now issued by popes, an Apostolic Constitution. However, the designation ‘encyclical’ does not always denote such a degree of significance. The archives at the Vatican website currently classify certain encyclicals as “Apostolic Exhortations”. This informal term generally indicates documents with a broader audience than the bishops alone.
Pope Pius XII held that Papal Encyclicals, even when they are not ex cathedra, can nonetheless be sufficiently authoritative to end theological debate on a particular question:
“ It is not to be thought that what is set down in Encyclical letters does not demand assent in itself, because in this the popes do not exercise the supreme power of their magisterium. For these matters are taught by the ordinary magisterium, regarding which the following is pertinent: “He who heareth you, heareth Me.” (Luke 10:16); and usually what is set forth and inculcated in Encyclical Letters, already pertains to Catholic doctrine. But if the Supreme Pontiffs in their acts, after due consideration, express an opinion on a hitherto controversial matter, it is clear to all that this matter, according to the mind and will of the same Pontiffs, cannot any longer be considered a question of free discussion among theologians.
—Humani Generis ”
Papal use of encyclicals
Encyclicals indicate high Papal priority for a issue at a given time. Pontiffs define when, and under which circumstances encyclicals should be issued. They may choose to issue an apostolic constitution, bull, encyclical, apostolic letter or give a papal speech. Popes have differed on the use of encyclicals: on the issue of birth control and contraception, Pope Pius XI issued the encyclical Casti Connubii, while Pope Pius XII gave a speech to midwives and the medical profession, clarifying his position on the issue. [1] Pope Paul VI published an encyclical Humanae Vitae on the same topic. On matters of war and peace, Pope Pius XII issued ten encyclicals, mostly after 1945, three of them protesting the Soviet invasion of Hungary in order to crackdown on the Hungarian Revolution in 1956: Datis Nuperrime, Sertum Laetitiae, Luctuosissimi Eventus. Pope Paul VI spoke about the war in Vietnam and Pope John Paul II, issued a protest against the war in Iraq using the medium of speeches. On social issues, Pope Leo XIII promulgated Rerum Novarum (1891), which was followed by the Quadragesimo Anno (1931) of Pius XI, and the Centesimus Annus (1991) of John Paul II. Pius XII spoke on the same topic to a consistory of cardinals, in his Christmas messages and to numerous academic and professional associations. [2]
