Library Eusebius of Caesarea On Ecclesiastical Theology
Book 3
Chapter 20: That as the Father is in the Son and the Son in the Father, so also he will be in all the saints
And again, the Father was in him and he in the Father in the same way as the divine apostle teaches concerning all who are worthy of the heavenly kingdom, saying, “Then shall God be all in all,” just as “I will dwell in them, and walk in them” has also been said. Moreover, we too “in him live, and move, and have our being.” And all these things have been said concerning us, who subsist and live each in our own hypostasis and have nothing in common with the Father’s Godhead.
Why, then, should one marvel if similar expressions are used of the Son also—expressions that do not abolish his hypostasis, nor teach that he himself is both Father and Son, but set forth the Father’s special and exceptional honour toward him, and the glory of the only-begotten and divine communion?
Greek: Erich Klostermann, Eusebius Werke IV (Leipzig: Hinrichs, 1906), pp. 60–182. Digital Greek via Open Greek and Latin / Interlinea (CC BY-SA 4.0). English: study translation by Claude Opus 5.5 for BWAB Library—not the copyrighted CUA Press (Spoerl/Vinzent 2017) text. Technical terms and contested passages may be revised.