Ephesians 4:18

Understanding [δ ι α ν ο ι α]. See on Luke 1:51. The moral understanding.

Life of God [ζ ω η ς]. See on John 1:4. The life which God bestows; life in Christ. See 1 John 5:11.

Through the ignorance. The cause of the alienation. Not to be construed with darkened, since ignorance is the effect, and not the cause, of the darkness of the understanding Which is in them [τ η ν ο υ σ α ν ε ν α υ τ ο ι ς]. The participle of the substantive verb expresses the deep - seated, indwelling character of the ignorance.

Hardening [π ω ρ ω σ ι ν]. See on Mark 3:5. Dependent, like ignorance, on allienated. Arrange the whole clause thus : The Gentiles walk in the vanity of their mind, being darkened in their understanding, being alienated from the life of God, because of the ignorance that is in them, because of the hardening of their heart.