1 A man of solitude (who keeps to himself) (isolates himself) seeks his own (selfish) desire. He objects to sound wisdom.
4 The words of a man's mouth are deep waters. It is like a flowing brook and a wellspring of wisdom.
15 The mind of the prudent acquires knowledge. The ear of the wise one searches for knowledge.
19 A brother offended is harder to be won than a strong city. Their arguments are like the bars of a castle.
20 A man's stomach will be satisfied with the fruit of his mouth. He will be filled with the produce from his lips.