Here in chapter 26, the writer gives us a large section that identifies the fool and his characteristics.
These six things doth the Lord hate: yea, seven are an abomination unto him: A proud look, a lying tongue, and hands that shed innocent blood, An heart that deviseth wicked imaginations, feet that be swift in running to mischief, A false witness that speaketh lies, and he that soweth discord among brethren.
The men of Hezekiah have done us all a favor by copying out these verses. This chapter is divided by six sections, wisdom for the king kicks things off.
Your heart is in view in a big way in chapter 23. Look on the outline for the green shaded areas where “thine heart” is mentioned. Compare the first five with the last one, number six, and be warned.