The intent of the Father is to put Himself on display in creation through His sons. Each human being has been predestined to sonship. We come to this position in Christ, who reconciles us to the Father and brings us into our inheritance. Each individual son of God must pursue maturity in Christ, but the fullness of God will be revealed in the corporate son coming into maturity.
The fullness of God is all of Himself that He ever intends to be revealed in the earth. This can only happen through His church, the body of Christ, the corporate son of God in the earth. The fullness will never be observed in one individual, but only in a body that is one. The measure of oneness in the Spirit that is manifest, will be the measure to which His glory will be seen on the earth.
Our oneness with the Father, in the Son, by the Spirit and our oneness with the body is a package deal. We can never fully know God as isolated individuals and God will never fully reveal Himself except through the corporate body. We must continue to be equipped until we all reach oneness in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ.