The lips of the righteous {i} feed many: but fools die for lack of wisdom.

(i) For they speak truth and edify many by exhortations, admonition and counsel.

Wesley's Notes

10:21 Feed - By their wise discourses and counsels. Die - They have not wisdom to preserve themselves, much less to feed others.

King James Translators' Notes

of wisdom: Heb. of heart

Jamieson-Fausset-Brown Bible Commentary

21. Fools not only fail to benefit others, as do the righteous, but procure their own ruin (compare Pr 10:11, 17; Ho 4:6).

Matthew Henry's Concise Commentary

10:7. Both the just and the wicked must die; but between their souls there is a vast difference. 8. The wise in heart puts his knowledge in practice. 9. Dissemblers, after all their shuffling, will be exposed. 10. Trick and artifice will be no excuse for iniquity. 11. The good man's mouth is always open to teach, comfort, and correct others. 12. Where there is hatred, every thing stirs up strife. By bearing with each other, peace and harmony are preserved. 13. Those that foolishly go on in wicked ways, prepare rods for themselves. 14. Whatever knowledge may be useful, we must lay it up, that it may not be to seek when we want it. The wise gain this wisdom by reading, by hearing the word, by meditation, by prayer, by faith in Christ, who is made of God unto us wisdom. 15. This refers to the common mistakes both of rich and poor, as to their outward condition. Rich people's wealth exposes them to many dangers; while a poor man may live comfortably, if he is content, keeps a good conscience, and lives by faith. 16. Perhaps a righteous man has no more than what he works hard for, but that labour tends to life. 17. The traveller that has missed his way, and cannot bear to be told of it, and to be shown the right way, must err still. 18. He is especially a fool who thinks to hide anything from God; and malice is no better. 19. Those that speak much, speak much amiss. He that checks himself is a wise man, and therein consults his own peace. 20,21. The tongue of the just is sincere, freed from the dross of guile and evil design. Pious discourse is spiritual food to the needy. Fools die for want of a heart, so the word is; for want of thought.

Matthew Henry's Whole Bible Commentary

Verses 20-21

We are here taught how to value men, not by their wealth and preferment in the world, but by their virtue.

I. Good men are good for something. Though they may be poor and low in the world, and may not have power and riches to do good with, yet, as long as they have a mouth to speak, that will make them valuable and useful, and upon that account we must honour those that fear the Lord, because out of the good treasure of their heart they bring forth good things. 1. This makes them valuable: The tongue of the just is as choice silver; they are sincere, freed from the dross of guile and evil design. God's words are compared to silver purified (Ps. 12:6), for they may be relied on; and such are the words of just men. They are of weight and worth, and will enrich those that hear them with wisdom, which is better than choice silver. 2. It makes them useful: The lips of the righteous feed many; for they are full of the word of God, which is the bread of life, and that sound doctrine wherewith souls are nourished up. Pious discourse is spiritual food to the needy, to the hungry.

II. Bad men are good for nothing. 1. One can get no good by them: The heart of the wicked is little worth, and therefore that which comes out of the abundance of his heart cannot be worth much. His principles, his notions, his thoughts, his purposes, and all the things that fill him, and affect him, are worldly and carnal, and therefore of no value. He that is of the earth speaks of the earth, and neither understands nor relishes the things of God, Jn. 3:31; 1 Co. 2:14. The wicked man pretends that, though he does not talk of religion as the just do, yet he has it within him, and thanks God that his heart is good; but he that searches the heart here says the contrary: It is nothing worth. 2. One can do no good to them. While many are fed by the lips of the righteous, fools die for want of wisdom; and fools indeed they are to die for want of that which they might so easily come by. Fools die for want of a heart (so the word is); they perish for want of consideration and resolution; they have no heart to do any thing for their own good. While the righteous feed others fools starve themselves.