'The Last of the Fathers'on Dogmatic Pneumatology

We likewise believe in the Holy Spirit,
the Lord and Giver of Life,
Who proceeds from the Father,
and abides in the Son;

Who is adored and glorified

with the Father and the Son

as co-Essential and co-eternal with Them;

Who is the true and authoritative Spirit of God,

the Source of wisdom and life and sanctification;

Who is God together with the Father and Son,

and is thus proclaimed;

Who is uncreated, full, creative, almighty;

Who is ever-active, all-powerful, infinite in strength;

Who rules over all creation, but is not ruled,

Who deifies everything, but is not deified,

Who fills all things, but is not filled,

Who is participated, but does not participate,

Who sanctifies, but is not sanctified,

Who receives the intercessions of all, and is The Intercessor;

Who is like the Father and the Son in all things;

Who proceeds from the Father,

and is communicated through the Son,

and is participated in by all creation;

Who through himself creates and gives being to all things,

and sanctifies and preserves them;

Who is distinctly Personal,

and exists as his own Person,

indivisible and inseparable from the Father and the Son;

Who has all things that the Father and Son have,

except that he is not the Unbegotten Father,

nor is he the Only-Begotten Son!

St John Damascene,
Expositio de fide Orthodoxa, I.8