Volumes 1 and 2 present the foundation for understanding Godís purpose worked out in the eons through Christ Jesus, our Lord and Savior.
The purpose of God will be achieved when all things in the heavens and on the earth have been summed up in Christ, which will occur in the fullness of times or, what is called, the consummation of the eons.
Christ has been raised from among the dead and seated at the right hand of God among the celestials, up over every sovereignty and authority and power and lordship, and every name that is named, not only in this eon, but also in that which is impending. In the capacity of Head, God has subjected all under His feet, and has given Him, as Head over all, to the ecclesia which is His body, the complement of the One completing the all in all (see Ephesians 1.20-22 CV). Christ is the Head of all and the Head of His body, and He will fulfill the purpose of the eons through His body. This is a profound truth.
Volume 3 continues by building on this truth.
May the eyes of your heart be enlightened!
In all wisdom and insight He made known to us the mystery of His will, according to His kind intention which He purposed in Him with a view to an administration suitable to the fullness of the times,
†the summing up of all things in Christ,
things in the heavens and things on the earth.
(Ephesians 1.7-10 NASB)