We Are Knit Into The Godhead

He hath given us of His Spirit.’ Therefore because of the grace of the Spirit which has been given to us, in Him we come to be, and He in us; and since it is the Spirit of God, therefore through His becoming in us, reasonably are we, as having the Spirit, considered to be in God, and thus is God in us. Not then as the Son in the Father, so also we become in the Father; for the Son does not merely partake the Spirit, that therefore He too may be in the Father; nor does He receive the Spirit, but rather He supplies It Himself to all; and the Spirit does not unite the Word to the Father, but rather the Spirit receives from the Word. And the Son is in the Father, as His own Word and Radiance; but we, apart from the Spirit, are strange and distant from God, and by the participation of the Spirit we are knit into the Godhead; so that our being in the Father is not ours, but is the Spirit’s which is in us and abides in us, while by the true confession we preserve it in us, John again saying, ‘Whosoever shall confess that Jesus is the Son of God, God dwelleth in him and he in God.”
St. Athanasius Against the Arians Book 3, Chapter 24.