This is the Athanasian Creed, which is one of the four authoritative creeds of the Roman Catholic Church/Early Christian Church. Sometimes known as Quicunque Vult or Quicumque Vult (for the opening two words of it in Latin). This creed is named after Athanasius (AD 293-373), the champion of orthodoxy against Arian attacks on the doctrine of the Trinity. It was developed in the Fifth Century AD.
The Athanasian Creed
1. WHOSOEVER would be saved / needeth before all things to hold fast the Catholic Faith.
2 Which Faith except a man keep whole and undefiled, / without doubt he will perish eternally.
3 Now the Catholic Faith is this, / that we worship one God in Trinity, and the Trinity in Unity;
4 Neither confusing the Persons, / nor dividing the Substance.
5 For there is one Person of the Father, another of the Son, / another of the Holy Ghost;
6 But the Godhead of the Father, and of the Son, and of the Holy Ghost is all one, / the glory equal, the majesty co-eternal.
7 Such as the Father is, such is the Son, / and such is the Holy Ghost;
8 The Father uncreated, the Son uncreated, the Holy Ghost uncreated;
9 The Father infinite, the Son infinite, the Holy Ghost infinite;
10 The Father eternal, the Son eternal, the Holy Ghost eternal;
11 And yet there are not three eternals, but one eternal;
12 As also there are not three uncreated, nor three infinites, / but one infinite, and one uncreated.
13 So likewise the Father is almighty, the Son almighty, / the Holy Ghost almighty;
14 And yet there are not three almighties, but one almighty.
15 So the Father is God, the Son God, the Holy Ghost God;
16 And yet there are not three Gods, / but one God.
17 So the Father is Lord, the Son Lord, / the Holy Ghost Lord;
18 And yet there are not three Lords, / but one Lord.
19 For like as we are compelled by the Christian verity / to confess each Person by himself to be both God and Lord;
20 So are we forbidden by the Catholic Religion / to speak of three Gods or three Lords.
21 The Father is made of none, / nor created, nor begotten.
22 The Son is of the Father alone; / not made, nor created, but begotten.
23 The Holy Ghost is of the Father and the Son; / not made, nor created, nor begotten, but proceeding.
24 There is therefore one Father, not three Fathers; one Son, not three Sons; / one Holy Ghost, not three Holy Ghosts.
25 And in this Trinity there is no before or after, / no greater or less;
26 But all three Persons are co-eternal together, / and co-equal.
27 So that in all ways, as is aforesaid, / both the Trinity is to be worshipped in Unity, and the Unity in Trinity.
28 He therefore that would be saved, / let him thus think of the Trinity.
29 FURTHERMORE, it is necessary to eternal salvation, / that he also believe faithfully the Incarnation of our Lord Jesus Christ.
30 Now the right Faith is that we believe and confess / that our Lord Jesus Christ, the Son of God, is both God and Man.
31 He is God, of the Substance of the Father, begotten before the worlds; / and he is Man, of the Substance of his Mother, born in the world;
32 Perfect God; / perfect Man, of reasoning soul and human flesh subsisting;
33 Equal to the Father as touching his Godhead;/ less than the Father as touching his Manhood.
34 Who although he be God and Man, / yet he is not two, but is one Christ;
35 One, however, not by conversion of Godhead into flesh, / but by taking of Manhood into God;
36 One altogether; / not by confusion of Substance, but by unity of Person.
37 For as reasoning soul and flesh is one man, so God and Man is one Christ;
38 Who suffered for our salvation, / descended into hell, rose again from the dead;
39 Ascended into heaven, sat down at the right hand of the Father, / from whence he shall come to judge the quick and the dead.
40 At whose coming all men must rise again with their bodies, / and shall give account for their own deeds.
41 And they that have done good will go into life eternal; / they that have done evil into eternal fire.
42 THIS is the Catholic Faith, / which except a man do faithfully and stedfastly believe, 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.