27:1 Do not boast about tomorrow;
for you do not know what a day may bring forth.
27:2 Let another praise you, and not your own mouth;
someone else, and not your own lips.
27:3 A stone is heavy and sand is weighty,
but vexation by a fool is more burdensome than the two of them.
27:4 Wrath is cruel and anger is overwhelming,
but who can stand before jealousy?
27:5 Better is open rebuke
than hidden love.
27:6 Faithful are the wounds of a friend,
but the kisses of an enemy are excessive.
27:7 The one whose appetite is satisfied loathes honey,
but to the hungry mouth every bitter thing is sweet.
27:8 Like a bird that wanders from its nest,
so is a person who wanders from his home.
27:9 Ointment and incense make the heart rejoice,
likewise the sweetness of one’s friend from sincere counsel.
27:10 Do not forsake your friend and your father’s friend,
and do not enter your brother’s house in the day of your disaster;
a neighbor nearby is better than a brother far away.
27:11 Be wise, my son, and make my heart glad,
so that I may answer anyone who taunts me.
Wiersbe notes the following instances where foolish sons brought grief to their parents: ‘Cain grieved his parents when he killed his brother Abel (Gen. 4). Esau deliberately married heathen women just to provoke his father Isaac (Gen. 28:6–9). Jacob’s sons lied to him about their brother Joseph and broke his heart (Gen. 37). Samson grieved his parents by living with pagan women and fraternizing with the enemies of Israel (Jud. 13–16). David’s sons broke his heart with their evil ways. Amnon violated his half sister Tamar and Absalom killed him for doing it (2 Sam. 13). Then Absalom rebelled against David and seized the kingdom (2 Sam. 15–18).’
27:12 A shrewd person sees danger and hides himself,
but the naive keep right on going and suffer for it.
27:13 Take a man’s garment when he has given security for a stranger,
and when he gives surety for a stranger, hold him in pledge.
27:14 If someone blesses his neighbor with a loud voice early in the morning,
it will be counted as a curse to him.
27:15 A continual dripping on a rainy day
and a contentious wife are alike.
27:16 Whoever hides her hides the wind
or grasps oil with his right hand.
27:17 As iron sharpens iron,
so a person sharpens his friend.
27:18 The one who tends a fig tree will eat its fruit,
and whoever takes care of his master will be honored.
27:19 As in water the face is reflected as a face,
so a person’s heart reflects the person.
27:20 As Death and Destruction are never satisfied,
so the eyes of a person are never satisfied.
27:21 As the crucible is for silver and the furnace is for gold,
so a person is proved by the praise he receives.
27:22 If you should pound the fool in the mortar
among the grain with the pestle,
his foolishness would not depart from him.
‘Women in the ancient world ground grain in a bowl (mortar) using a hard tool (pestle) with which they could crack and pulverize the kernels. The image is clear: no amount of pressure or pain will change a fool and make anything useful out of him. Wise parents should discipline foolish children to give them hope (22:15), but a foolish adult can be changed only by the grace of God. Unless fools repent and turn to the Lord, they will live as slaves (11:29) and “die without instruction” (5:23).’ (Wiersbe)