John 8:43
Why do you people not understand what I am saying? It is because you cannot [bear to] listen to my message.
Romans 3:11
No one understands [everything]. No one looks to God [all the time].
1 Corinthians 6:16
Or, do you not know that the person who is joined to a prostitute is one body [with her, physically]? For God says [Gen. 2:24], "The two will become one flesh" [i.e., united in such a close relationship as to practically constitute one body].
Ephesians 4:18
Their understanding [of spiritual things] is darkened and excluded from the [spiritual] life that God gives, because of the ignorance in their minds and the stubbornness in their hearts.
Hebrews 12:8
But if you do not receive [such] discipline, like all of us do, then you are illegitimate children and not true children.