17 So this I say, and affirm together with the Lord, that you walk no longer just as the Gentiles also walk, in the futility of their mind, 18 being darkened in their understanding, excluded from the life of God because of the ignorance that is in them, because of the hardness of their heart; 19 and they, having become callous, have given themselves over to sensuality for the practice of every kind of impurity with greediness. Ephesians 4:17-19 (NASB)
In the passage above (Ephesians 4:17-19) the word “ignorance” translates the noun ἄγνοιαν (agnoian) the accusative singular feminine case of ἄγνοια (agnoia) which does mean “ignorance.”….
This ignorance is not caused by something external, but by man himself. In ancient Greek usage of this word it could refer to a man who lives without knowledge either because he hasn’t heard the truth or because he has refused the truth, and that if he had received it, it would have freed him from his ignorance of his origin. In other words, he just closed his eyes to the truth; he refused to believe what was right in front of him. Do you know anyone like that?