Romans 1:31
they do not have any sense; they do not keep their promises; they fail to show natural affection; and they are merciless.
2 Timothy 3:3
lacking in natural affection, unwilling to be reconciled [to their enemies], slanderers, lacking self-control, brutal, haters of what is good,
Matthew 15:16
And He replied, "Are you still unable to understand?
Romans 1:20-21
For since the creation of the world, God's invisible qualities of eternal power and divine nature have been clearly seen, [capable of] being perceived through the things that He has made. So, these people have no excuse [i.e., for not believing in Him].
Romans 3:11
No one understands [everything]. No one looks to God [all the time].