What is the Catholic theological basis for the Munificentissimus Deus?

> If you are looking for direct scriptural proof of this dogma, you will not find any. Mary’s Assumption was not explicitly recorded in Scripture. However, Pope Pius XII formally defined the dogma of the Assumption in his apostolic constitution **[Munificentissimus Deus](http://en.wikipedia.org/wiki/Munificentissimus_Deus)** on November 1, 1950: "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" (source ) My Question: - What is the Catholic theological basis for the Munificentissimus Deus? If it wasn't recorded in Scripture, and we don't have any archaeological evidence to support it, then what did Pope Pius XII use as a basis?