<p>4:13- see on Heb. 2:10.</p><p><i>Until we all attain to the unity of the faith and of the knowledge of the Son of God to a full grown man, to the measure of the stature of the fullness of Christ</i>- &quot;The unity&quot; and &quot;the faith&quot; each have the article and grammatically do not together mean 'the one faith'. They refer to the unity created by the one faith. And that is Paul's theme here- of unity between Jew and Gentile created by having the same one faith, which is the knowledge of the Son of God. And 'knowledge' refers to the knowing which refers to relationship, rather than knowing an identical set of theological propositions about the Son of Go. It is&nbsp;common relationship with Him which creates unity between groups and individuals as diverse and separated as Jew and Gentile were in first century towns like Ephesus. It is that unity between persons within the church which is the sign of maturity, of having grown up into stature of the Lord Jesus, and in which His fullness will dwell. His fullness refers to the full total sum of His personality, His 'Name', in Old testament terms. Each individual believer has various parts of His total personality, and between us, the united, mature church is completely His body to the world, they are Him in total. But division amongst us precludes us on a collective level from being Him in totality.</p><p>The body of believers is progressively educated, matured, built up, until finally at the Lord's return we are all brought to be like Christ, to know Him fully, and to &quot;the unity of the faith&quot;. The implication would therefore be that there will never be total understanding of &quot;the faith&quot; in its fullness, nor will there be &quot;unanimity&quot; amongst us on every point as a body, until the Lord is back.</p><p>Eph. 4:13 parallels the knowledge of the Son of God with &quot;the unity of the faith&quot;. To know the one faith is to know Christ as a person. He <i>is</i> the essence of the one faith. Academic knowledge of a series of theological propositions in a 'statement of faith', no matter how accurate their formulation may be, is still not the same as 'knowing Christ'. To perceive those doctrines as they really are, to know the unity, the sum of the one faith, is to know Christ as a person and come to &quot;the fullness of Christ&quot;. The <i>unity</i> of the faith thus parallels the <i>fullness</i> of Christ. Those doctrines as propositions are a means to an end; and unless that is perceived they are little worth. So very often men have argued over those propositions, and in their argument have revealed that they really 'don't get it'- they simply don't know Christ as a person. They got caught up on the means rather than perceiving the end- which is to know the Son of God.</p>