The Bible Speaks about Foolishness.
Psalm 69:5 NKJV
O God, You know my foolishness; And my sins are not hidden from You.
Psalm 107:17-21 NKJV
Fools, because of their transgression, And because of their iniquities, were afflicted.  Their soul abhorred all manner of food, And they drew near to the gates of death.  Then they cried out to the LORD in their trouble, And He saved them out of their distresses.  He sent His word and healed them, And delivered them from their destructions.  Oh, that men would give thanks to the LORD for His goodness, And for His wonderful works to the children of men!
Proverbs 1:7 NKJV
The fear of the LORD is the beginning of knowledge, But fools despise wisdom and instruction.
Proverbs 22:15 NKJV
Foolishness is bound up in the heart of a child; The rod of correction will drive it far from him.
Proverbs 24:8-11 NKJV
He who plots to do evil Will be called a schemer.  The devising of foolishness is sin, And the scoffer is an abomination to men.  If you faint in the day of adversity, Your strength is small.  Deliver those who are drawn toward death, And hold back those stumbling to the slaughter.
Mark 7:18-23 NKJV
So He said to them, “Are you thus without understanding also? Do you not perceive that whatever enters a man from outside cannot defile him,  because it does not enter his heart but his stomach, and is eliminated, thus purifying all foods?”  And He said, “What comes out of a man, that defiles a man.  For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,  thefts, covetousness, wickedness, deceit, lewdness, an evil eye, blasphemy, pride, foolishness.  All these evil things come from within and defile a man.”
Romans 1:20-22 NKJV
For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse,  because, although they knew God, they did not glorify Him as God, nor were thankful, but became futile in their thoughts, and their foolish hearts were darkened.  Professing to be wise, they became fools,