Reasons why we believe in the dogma of Assumption Pope Pius XII in the papal document Munificentimus Deus gives four reasons for our belief in the Dogma of Assumption of Mary. 

1) The uninterrupted tradition about Mary’s death and Assumption  starting from the first century. 

2) The belief expressed in all the ancient liturgies of the Church. 

3) The negative evidence — the absence and veneration of a tomb of Mary while most of the apostles have their tombs can still be visited today. 

4) The possibility of bodily assumption warranted in the Old Testament in the cases of Enoch (Gn 5:24), perhaps Moses (Dt 34:5), and especially Elijah (II Kgs 2:1).5) 5)The theological reasons: a) The degeneration of the body after death is the consequence of “original sin,” and Mary, as “Immaculately Conceived,” is exempted from the post-mortem decay of the body. b) As receiver of the fullness of grace and holiness because she is mother of Jesus and co-redeemer with Him, Mary’s place is with her son, God’s Son Jesus, the Redeemer, in the abode of holiness, Heaven. When her earthly life was over, she was not tainted by sin, but given the extreme gift that Jesus could give her, eternal life with Him in heaven forever. We never separate the child from the mother who gave Him life!