"We declare, pronounce, and define that the doctrine which holds that the most Blessed Virgin Mary, in the first instance of her conception, by a singular grace and privilege granted by Almighty God, in view of the merits of Jesus Christ, the Savior of the human race, was preserved free from all stain of original sin, is a doctrine revealed by God and therefore to be believed firmly and constantly by all the faithful." [See here for background; see also Timothy G. McCarthy. The Catholic Tradition: The Church in the Twentieth Century. 2nd Edition. Chicago: Loyola Press, 1998, 373.]The Immaculate Conception of Mary is a profound doctrine. Within it are hidden the foundations and implications of Christian Avataric Non-Dualism.
Christian dogma has no limit. That is, the literal meanings of the dogmas do not exhaust the dogma's meanings. The literal meanings of the dogmas do not exclude additional implications, implications easily dismissed or rejected when only the literal meaning is considered. The dogmas are experimental hypotheses, working definitions, if you will, whose practicality and reality must be tested in the laboratory of one's own body-mind. In fact, to paraphrase the Buddha Shakyamuni, the final origin and end of Christian dogma cannot be seen. Dogma arises, shines, and subsides within the very Heart. The final origin and end of Christian dogma can only be known from, in, and as the very Heart.