John 8:43
Why do you not know what I say? Because you can not understand my words.
Romans 3:11
there is none that understands; there is none that seeks after God;
1 Corinthians 6:16
Know you not that he that is joined to a harlot, is one body? For the two, says the scripture, shall be one flesh.
Ephesians 4:18
darkened in their understanding, alienated from the life of God through the ignorance that is in them, because of the hardness of their heart;
Hebrews 12:8
But if you are without chastisement, of which all are par takers, then are you bastards, and not sons.