The chapter begins with a warning: wine is a mocker and strong drink a brawler, and whoever is led astray by them is not wise (v. 1). Whoever provokes a king to anger forfeits his life, while keeping away from strife is an honor to a man (vv. 2-3). The sluggard does not plow in the autumn, so at harvest he looks and finds nothing (v. 4). The purposes of the heart are deep waters, but a man of understanding draws them out (v. 5), and a truly faithful person is hard to find (v. 6). The righteous walks in his integrity, and his children are blessed after him (v. 7).
The question of verse 9 is central: who can say, I have made my heart pure, I am clean from my sin? False weights and unequal measures are an abomination to the Lord (vv. 10, 23). Even a child is known by his deeds (v. 11), and the hearing ear and the seeing eye are both made by the Lord (v. 12). Loving sleep leads to poverty (v. 13), and the buyer says it is worth nothing, then boasts about it (v. 14). Lips that know are a precious jewel (v. 15). One should not associate with a gossip (v. 19).
The final part teaches not to take revenge: do not say, I will repay evil, but wait for the Lord, and he will deliver you (v. 22). A person's steps are directed by the Lord, so how can anyone understand his own way? (v. 24). It is a snare to make a rash vow and only afterward to reflect (v. 25). The glory of young men is their strength, and the splendor of old men is their gray hair (v. 29). The spirit of man is the lamp of the Lord, searching his innermost parts (v. 27), and blows that wound cleanse away evil (v. 30).