12 His intention was the perfecting and the full equipping of the saints (His consecrated people), [that they should do] the work of ministering toward building up Christ's body (the church),
13 [That it might develop] until we all attain oneness in the faith and in the comprehension of the [full and accurate] knowledge of the Son of God, that [we might arrive] at really mature manhood (the completeness of personality which is nothing less than the standard height of Christ's own perfection), the measure of the stature of the fullness of the Christ and the completeness found in Him.
14 So then, we may no longer be children, tossed [like ships] to and fro between chance gusts of teaching and wavering with every changing wind of doctrine, [the prey of] the cunning and cleverness of unscrupulous men, [gamblers engaged] in every shifting form of trickery in inventing errors to mislead.
15 Rather, let our lives lovingly express truth [in all things, speaking truly, dealing truly, living truly]. Enfolded in love, let us grow up in every way and in all things into Him Who is the Head, [even] Christ (the Messiah, the Anointed One).
16 For because of Him the whole body (the church, in all its various parts), closely joined and firmly knit together by the joints and ligaments with which it is supplied, when each part [with power adapted to its need] is working properly [in all its functions], grows to full maturity, building itself up in love.
17 So this I say and solemnly testify in [the name of] the Lord [as in His presence], that you must no longer live as the heathen (the Gentiles) do in their perverseness [in the folly, vanity, and emptiness of their souls and the futility] of their minds.
18 Their moral understanding is darkened and their reasoning is beclouded. [They are] alienated (estranged, self-banished) from the life of God [with no share in it; this is] because of the ignorance (the want of knowledge and perception, the willful blindness) that is deep-seated in them, due to their hardness of heart [to the insensitiveness of their moral nature].