Related post: Against Knowledge
The verses listed here have in common that they indicate an absence or diminishment of understanding.
An asterisk at the beginning of a citation indicates that it is a non-explicit reference to the subject.
Matthew 15:16 – “…’Are you still lacking in understanding also?'”
*Matthew 16:3 – The Pharisees and Sadducees did not understand the times as they should have (1 Chronicles 12:32). See Deuteronomy 32:28, 29 below where Moses laments similiarly to the way Jesus is here lamenting.
Mark 7:18 – “…’Are you so lacking in understanding also?’…”
John 3:10 – You can know a lot about the Scriptures, and even be respected for your knowledge of them, and still not understand God (John 5:39, 40).
1 Timothy 1:6, 7 – “…they do not understand either what they are saying or the matters about which they make confident assertions.” – Just because a person sounds confident, it does not mean that they understand what they are talking about.
2 Peter 3:16 – Some things in the Scriptures are not easily understood. For this reason we should lean on God’s promise through Paul to Timothy: 2 Timothy 2:7.
Deuteronomy 32:28,29 – The phrase “lacking in counsel” is echoed by “no understanding.” The absence of wisdom and understanding means the inability to “discern.” Regarding this discernment of the future, see the note on Matthew 16:3 above.
Psalm 49:20 – Our understanding – particularly our moral reasoning powers – distinguishes us from animals. Or at least it ought to. See Men Likened to Animal and Such.
Proverbs 9:4 – “‘Whoever is naive, let him turn in here!’ To him who lacks understanding she says,”
Proverbs 9:16 – “‘Whoever is naive, let him turn in here,’ And to him who lacks understanding she says,”
Proverbs 10:13 – “On the lips of the discerning, wisdom is found, but a rod is for the back of him who lacks understanding.”
Proverbs 10:2 – “The lips of the righteous feed many, but fools die for lack of understanding.”
Proverbs 11:12 – “He who despises his neighbor lacks sense, but a man of understanding keeps silent.”
Proverbs 15:21 – “Folly is joy to him who lacks sense, but a man of understanding walks straight.”
Proverbs 28:16 – “A leader who is a great oppressor lacks understanding, but he who hates unjust gain will prolong his days.”