The Four Things Catholics Believe About Mary

Because Jesus Christ is truly God and truly man, Mary is truly the Mother of God, not because she originated Christ’s divinity, but because she bore the divine Person of the Son.

This dogma was formally defined at the Council of Ephesus in 431.

The council taught that Mary is Theotokos—“God-bearer” or “Mother of God”—because the child she bore is one divine Person, Jesus Christ, truly God and truly man. This does not mean that Mary existed before God or caused Christ’s divinity; it means she is the mother of the Person who is God the Son.

Luke 1:35: The child conceived in Mary is the holy Son of God.

Luke 1:43: Elizabeth calls Mary “the mother of my Lord.”

John 1:14: The eternal Word truly became flesh.

The early Church connected Mary’s divine motherhood with her fullness of grace and her unique association with Christ.

Mary was a virgin before, during, and after the birth of Jesus. The title “ever-Virgin” is included in the Church’s definition of the Assumption.

Mary's perpetual virginity was most precisely defined in 649, at the Lateran Synod under Pope Martin I, but the teaching was also affirmed in earlier creeds and councils, including the Second Council of Constantinople in 553.

The doctrine teaches that Mary was a virgin before, during, and after Christ’s birth. The references to Jesus’ “brothers” are understood according to ancient biblical usage and Church tradition, not as proof that Mary had other biological children.

Luke 1:34: Mary asks how she will conceive since she does not know man, indicating a virginal conception.

Matthew 1:25: The text says Joseph did not know Mary “until” Jesus was born; “until” does not necessarily imply a change afterward.

Luke 1:35: Christ’s conception is attributed uniquely to the Holy Spirit.

The Church’s solemn Assumption formula itself calls Mary “the ever Virgin Mary.”

The dogma teaches that Mary, from the first moment of her conception, was preserved from original sin by a unique grace of God, through the anticipated merits of Jesus Christ. It does not refer to the virginal conception of Jesus.

This was defined by Pope Pius IX on December 8, 1854 in Ineffabilis Deus.

Pius IX defined that Mary:

“At the first instant of her conception, by a singular grace and privilege of Almighty God, in virtue of the merits of Christ Jesus … was preserved immaculate from all stain of original sin.”

Luke 1:28: The angel addresses Mary as “full of grace.”

Genesis 3:15: The woman and her offspring stand in opposition to the serpent; Christian tradition sees Mary as the New Eve.

Luke 1:46–49: Mary’s holiness and the “great things” God has done in her.

The Fathers repeatedly described Mary as undefiled, immaculate, and free from sin.

The biblical evidence is primarily typological and theological, not a single verse explicitly stating the dogma. The Catholic tradition understands Mary’s preservation as a special form of redemption by Christ, not as freedom from the need for a Savior.

At the completion of her earthly life, Mary was taken body and soul into heavenly glory.

Pope Pius XII defined this as a divinely revealed dogma on November 1, 1950 in Munificentissimus Deus.

Pius XII declared:

“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.”

1 Corinthians 15:20–23, 42–54: Christ’s Resurrection is the source and pattern of the glorification of the body.

Luke 1:28: Mary’s fullness of grace.

Luke 1:43: Her divine motherhood.

Revelation 12: The woman gloriously associated with the Messiah and his victory.

The Church’s ancient liturgical and patristic witness, together with the bishops’ widespread and nearly unanimous request for a definition, was considered by Pius XII.

Munificentissimus Deus presents the Assumption as fitting Mary’s intimate union with Christ and his victory over sin and death.