" So when did these last two originate? They transcend “whenness,” but if I must give a naive answer—when the Father did. When was that? There has not been a “when” when the Father has not been in existence. This, then, is true of the Son and of the Holy Spirit. Put another question and I will answer it. Since when has the Son been begotten? Since as long as the Father has not been begotten. "

― , On God and Christ, The Five Theological Orations and Two Letters to Cledonius: St. Gregory of Nazianzus