Theotokos Fresco at Visoki Dečani Monastery. Kosovo, Srbija.
Θεοτόκος , Богородица, Dei genetrix, God-bearer
"I am amazed that there are some who are entirely in doubt as to whether the holy Virgin should be called Theotokos or not. For if our Lord Jesus Christ is God, how is the holy Virgin who gave birth [to Him], not [Theotokos]?" ― Cyril of Alexandria †444
“If one does not acknowledge Mary as Theotokos, he is estranged from God.”— St. Gregory of Nazianzus 382 in an epistle to Cledonius
alternate translation: If anyone does not believe that Holy Mary is the Mother of God, he is severed from the Godhead.
Proclaimed to all the faithful at the Third Ecumenical Council of Ephesus in 431. An article of faith, that, logically, necessarily follows the propositions that Jesus is truly God and was born of Mary. Mary is the Mother of God. To-day, in this solemnity, it is observed.