The Book of Ephesians was written by the Apostle Paul. In it, Paul clearly reveals God's will towards us in the same word of faith as in all his other epistles.
The Book of Ephesians is the Word of God that records how God's children came into being and by what means God's Church and the will of God the Father were fulfilled on this earth To make all of us His children in His likeness and the image of His Son Jesus Christ, God the Father gave us the Gospel and He permitted His Church to those who believe.
We should approach Ephesians with a desire to understand the profound dispensation of God the Father that is revealed in it. God's will is for everyone to become His child and receive His heavenly blessings.
Todays's children of God who exist in this world are the ones who have already been sanctified by believing in the Gospel.