The Cappadocians and Eternal Begetting
...for the Cappadocians the Son's eternal begetting means that he is of the same being and power as the Father; he is not ranked below him and not exterior to him. The Father, the Son and the Holy Spirit share the most perfect communion of being.
Kevin Giles, The Eternal Generation of the Son: Maintaining Orthodoxy in Trinitarian Theology (Downers Grove, IL: InterVarsity Press, 2012), 6