<b>The Trinity</b>
Now the Catholic faith is this,
that we worship One God in the Trinity and the Trinity in Unity,
neither confounding the Persons nor dividing the substance.
The Person of the Father is distinct, the Person of the Son is distinct, the Person of the Holy Ghost is distinct;
but of the Father and of the Son and of the Holy Ghost
the Divinity is One, the Glory equal, the Majesty co-eternal.
As the Father is, such is the Son, such is the Holy Ghost:
Uncreated is the Father, Uncreated is the Son, Uncreated is the Holy Ghost;
Infinite is the Father, Infinite is the Son, Infinite is the Holy Ghost;
Eternal is the Father, Eternal is the Son, Eternal is the Holy Ghost;
Any yet not three eternals, but One Eternal.
As there are not three uncreated, not three infinites, but One Uncreated and One Infinite.
Likewise, Almighty is the Father, Almighty is the Son, Almighty is the Holy Ghost;
And yet not three almighties, but One Almighty.
So the Father is God, the Son is God, the Holy Ghost is God;
And yet there are not three gods; there is but One God.
So the Father is Lord, the Son is Lord, the Holy Ghost is Lord;
And yet there are not three lords; there is but One Lord.
For we are compelled by Christian truth to confess that each Person is God and Lord;
so are we forbidden by the Catholic religion to say that there are three gods or lords.
The Father is made by none; not created, nor begotten.
The Son is from the Father alone; not made, nor created, but begotten.
The Holy Ghost is from the Father and the Son; not made, nor created, nor begotten, but proceeding.
Therefore, there is One Father, not three fathers;
there is One Son, not three sons;
there is One Holy Ghost, not three holy ghosts.
And in this Trinity there is none before or after, none greater or less;
but all Three Persons are co-eternal and co-equal.
So that, in all respects, as is aforesaid,
we must worship both the Unity of the Trinity and the Trinity in Unity.
<i>(DS 75: Solemn Teaching of the Church - 5th Century AD)</i>