Matthew 13:15

For these people's minds are dull, and their ears have difficulty hearing, and they have shut their eyes. For if this were not the case, they would perceive what they see with their eyes, and comprehend what they hear with their ears, and understand with their minds and would turn [back to God] again so I would heal them [from their sins].'

Romans 3:11

No one understands [everything]. No one looks to God [all the time].

Hebrews 11:6

And unless one has faith, it is impossible for him to be pleasing to God, for the person who comes to God must believe that He exists and that He rewards those who seek Him.

Treasury of Scripture Knowledge

Summary

The LORD looked down from heaven upon the children of men, to see if there were any that did understand, and seek God.

Bible References

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Matthew 13:15
For these people's minds are dull, and their ears have difficulty hearing, and they have shut their eyes. For if this were not the case, they would perceive what they see with their eyes, and comprehend what they hear with their ears, and understand with their minds and would turn [back to God] again so I would heal them [from their sins].'
Romans 3:11
No one understands [everything]. No one looks to God [all the time].