Proverbs. The Generic Fool.

Key Notes: The foolish and the sound mind.

There are five kinds of fools in Proverbs: the generic fool, the scoffer, the lazy, the simple and the drunkard. This lesson takes up the generic fool, the one who is complacent, self-determined and stubborn, simply refusing advice. This fool babbles, slanders, and enjoys doing wrong.

"Fools think their own way is right, but the wise listen to advice." (Prov. 12:15)

"The fear of the LORD is the beginning of knowledge; fools despise wisdom and instruction." (Prov. 1:7)

"The wise will inherit honor, but stubborn fools, disgrace." (Prov. 3:35)

"The wise of heart will heed commandments, but a babbling fool will come to ruin." (Prov. 10:8)

"The wise lay up knowledge, but the babbling of a fool brings ruin near. " (Prov. 10:14)

"Lying lips conceal hatred, and whoever utters slander is a fool." (Prov. 10:18)

"Doing wrong is like sport to a fool, but wise conduct is pleasure to a person of understanding." (Prov. 10:23)

" Those who trouble their households will inherit the wind, and the fool will be servant to the wise. " (Prov. 11:29)

An important NT word is sound-minded or sober (Gr. "sophrone"). It was a goal of the Greeks, but available through the Spirit of God.
"...for God did not give us a spirit of timidity, but a Spirit of power and love and self-control" (or "sound mind"). (IITim.1:7)
"For the grace of God has appeared for the salvation of all men, training us to renounce irreligion and worldly passions; and to live sober, upright and godly lives in the world, awaiting our Blessed Hope, the appearing of the glory of our great God and Savior Jesus Christ...." (Tit.2:12–13)