Discipline and righteousness (1-6).
v.1 Discipline. The wise son listens to the instruction of his parents and responds appropriately. The scoffer is not teachable and will not listen to rebuke.
v.2 Appetite. The wise speak well and eat well as a result. The faithless, however, speak and eat violence (against others).
v.3 Guard your lips. This proverbs teaches the wisdom in using discretion in your speech. The one who guards his lips preserves his life; the one with the big mouth will be ruined.
v.4 Diligence. Here is a contrast in outcomes between the soul that is diligent, who is fully satisfied, and the soul of the sluggard, who craves but gets nothing. The sluggard is driven by cravings but these desires are never satisfied because he refuses to do the necessary work.
v.5 Truth. The righteous are characterized by hating falsehood (and loving the truth). The wicked bring on shame (by their falsehood).
v.6 Righteousness. The man of integrity is guarded by his righteousness. The sinner is overthrown by his wickedness.
This section describes outcomes for (1) listening to discipline, (2) speaking well (wisely), (3) using discretion, (4) diligence, (5) loving truth, and (6) righteousness. In each case the outcome is positive and is contrasted with the negative outcome of doing the opposite.