Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ…. 1 Peter 1:2
We are surely aware that as human beings we can never know all of the Godhead. If we were capable of knowing all of the Godhead perfectly, we would be equal to the Godhead.
The early fathers in the church, in illustrating the trinity, pointed out that God the eternal Father is an infinite God, and that He is love. The very nature of love is to give itself but the Father could not give His love fully to anyone not fully equal to Himself. Thus we have the revelation of the Son Who is equal to the Father and of the eternal Father pouring out His love into the Son, Who could contain it, because the Son is equal with the Father!
Further, those ancient wise men reasoned, if the Father were to pour out His love on the Son, a medium of communication equal both to the Father and to the Son would be required, and this was the Holy Ghost!
So we have their concept of the Trinity—the ancient Father in the fullness of His love pouring Himself through the Holy Ghost, Who is in being equal to Him, into the Son Who is in being equal to the Spirit and to the Father!
Thus, all that man can know of God and His love in this life is revealed in Jesus Christ.