17 The root of all conduct is the heart;
18 four branches it shoots forth:Good and evil, death and life,and their absolute mistress is the tongue.
19 One may be wise and benefit many,yet appear foolish to himself.
20 One may be wise, but if his words are rejected,he will be deprived of all enjoyment.
22 When one is wise to his own advantage,the fruits of knowledge are seen in his own person.
23 When one is wise to the advantage of people,the fruits of knowledge are lasting.
24 One wise for himself has full enjoyment,and all who see him praise him.