For which reason, after we have poured forth prayers of supplication again and again to God, and have invoked the light of the Spirit of Truth, for the glory of Almighty God who has lavished his special affection upon the Virgin Mary, for the honor of her Son, the immortal King of the Ages and the Victor over sin and death, for the increase of the glory of that same august Mother, and for the joy and exultation of the entire Church; by the authority of our Lord Jesus Christ, of the Blessed Apostles Peter and Paul, and by our own authority, we pronounce, declare, and define it to be a divinely revealed dogma: that the Immaculate Mother of God, the ever Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory.
[The] Vatican Postal Administration released a set of two stamps on May 8, 1851. A Dogma is the proclaiming of a certain truth by the Pope, and it is to be accepted and believed by all of the Catholic Church. A Dogma never is declared on the spur of the moment. Many months and more often years are devoted to research and study of the article of faith. Theologians and Cardinals examine the Holy Scriptures and all available documents to ascertain the truth of the belief. Both the pros and cons are heard and the evidence carefully weighed. If, after this long study, the article of faith has been proven a fact it is defined and proclaimed by the reigning Pontiff as an infallible Dogma and must be accepted by the faithful. The belief that was defined and promulgated by Pope Pius XII in 1950, was the Assumption: the belief that upon the death of Mary, the Mother of God, her body as well as her soul rose to heaven on a cloud surrounded by Angels. The Blessed Virgin was the only mortal to be brought to heaven in this manner.