The Nicene-Constantinopolitan Creed: its core from the Council of Nicaea (325), expanded with the articles on the Holy Spirit at the Council of Constantinople (381). It entered the Roman Mass late — Rome adopted it in 1014, at the request of Emperor Henry II. It is sung on Sundays and greater feasts; the Latin Mass text confesses the Spirit's procession “from the Father and the Son” (Filióque).
Deinde ad medium Altaris extendens, elevans et jungens manus, dicit, si dicendum est, Credo in unum Deum, et prosequitur junctis manibus.
At the middle of the altar the priest intones the profession of faith; the Credo is said on Sundays and greater feasts and usually omitted on weekdays. At the word “Deum” the priest bows his head to the cross, likewise at “Jesum Christum” and “simul adorátur”, and at the end, at “Et vitam ventúri sǽculi”, he signs himself with the cross.
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Hic genuflectitur.
The rubric calls for a genuflection here: the priest kneels from “Et incarnátus est” until “Et homo factus est” — honoring the moment the Incarnation is confessed; the faithful genuflect with him.