The Creed of Saint Athanasius

Whosoever will be saved :
before all things it is necessary that he hold the Catholic Faith.
Which Faith except every one do keep whole and undefiled :
without doubt he shall perish everlastingly.
And the Catholic Faith is this:
That we worship one God in Trinity, and Trinity in Unity;
Neither confounding the Persons : nor dividing the Substance.
For there is one Person of the Father, another of the Son :
and another of the Holy Ghost.
But the Godhead of the Father, of the Son, and of the Holy Ghost, is all one :
the Glory equal, the Majesty co-eternal.
Such as the Father is, such is the Son : and such is the Holy Ghost.
The Father uncreate, the Son uncreate : and the Holy Ghost uncreate.
The Father incomprehensible, the Son incomprehensible :
and the Holy Ghost incomprehensible.
The Father eternal, the Son eternal : and the Holy Ghost eternal.
And yet they are not three eternals : but one eternal.
As also there are not three incomprehensibles, nor three uncreated :
but one uncreated, and one incomprehensible.
So likewise the Father is Almighty, the Son Almighty :
and the Holy Ghost Almighty.
And yet they are not three Almighties : but one Almighty.
So the Father is God, the Son is God : and the Holy Ghost is God.
And yet they are not three Gods : but one God.
So likewise the Father is Lord, the Son Lord : and the Holy Ghost Lord.
And yet not three Lords : but one Lord.
For like as we are compelled by the Christian verity :
to acknowledge every Person by himself to be God and Lord;
So are we forbidden by the Catholic Religion :
to say, there be three Gods, or three Lords.
The Father is made of none : neither created, nor begotten.
The Son is of the Father alone : not made, nor created, but begotten.
The Holy Ghost is of the Father and of the Son :
neither made, nor created, nor begotten, but proceeding.
So there is one Father, not three Fathers; one Son, not three Sons :
one Holy Ghost, not three Holy Ghosts.
And in this Trinity none is afore, or after other :
none is greater, or less than another;
But the whole three Persons are co-eternal together : and co-equal.
So that in all things, as is aforesaid :
the Unity in Trinity and the Trinity in Unity is to be worshipped.
He therefore that will be saved : must thus think of the Trinity.

Furthermore, it is necessary to everlasting salvation :
that he also believe rightly the Incarnation of our Lord Jesus Christ.
For the right Faith is, that we believe and confess :
that our Lord Jesus Christ, the Son of God, is God and Man;
God, of the Substance of the Father, begotten before the worlds :
and Man of the substance of his Mother, born in the world;
Perfect God and perfect Man :
of a reasonable soul and human flesh subsisting;
Equal to the Father, as touching his Godhead :
and inferior to the Father, as touching his Manhood;
Who, although he be God and Man : yet he is not two, but one Christ;
One, not by conversion of the Godhead into flesh :
but by taking of the Manhood into God;
One altogether, not by confusion of Substance : but by unity of Person.
For as the reasonable soul and flesh is one man :
so God and Man is one Christ:
Who suffered for our salvation :
descended into hell, rose again the third day from the dead.
He ascended into heaven, he sitteth on the right hand of the Father, God
Almighty : from whence he shall come to judge the quick and the dead.
At whose coming all men shall rise again with their bodies :
and shall give account for their own works.
And they that have done good shall go into life everlasting :
and they that have done evil into everlasting fire.

This is the Catholic Faith :
which except a man believe faithfully, he cannot be saved.
Glory be to the Father, and to the Son: and to the Holy Ghost;
As it was in the beginning, is now and ever shall be: world without end.
Amen