Photius negat posse dari quid notionale commune duabus personis, sed ait quidquid non est commune tribus personis esse personale, et proprium unius tantum personae.
Gratis id negat, neque ullum est principium theologicum in quo fundari possit haec negatio. Praeterea etiam admittit Photius missionem Spiritus Sancti esse communem Patri et Filio, unde Patres cum Scriptura dicunt Spiritum esse proprium utriusque.
--Dalmau, De Deo Uno et Trino, sec.420.
All that the Father has which is not Paternity he gives to the Son. This includes the act of spiration, which cannot be identical to the divine essence, since the Spirit Himself does not spirate.
That the principle in question--that whatever is not shared by all three persons is a personal property--is false may be proved by the fact that the Son and the Spirit have in common originating from the Father, while the Father alone is unoriginate.
