Екклесиаст 9:18

The following proverb also leans on the history above narrated: "Better is wisdom than weapons of war; and one sinner destroyeth much good." The above history has shown by way of example that wisdom accomplishes more than implements of war, כּלי ק = כּלי מל (Assyr. unut tahazi) (Note: Vid., Fried. Delitzsch's Assyr. Stud. p. 129.) i.e., than all the apparatus belonging to preparation for war. But the much good which a wise man is accomplishing or has accomplished, one sinner (חוטא) (Note: The Syr. (not the Targ.) had חטא before it, and thus realized it, which appears to correspond better with the parall. חכמה.) by treachery or calumny may render vain, or may even destroy, through mere malicious pleasure in evil. This is a synthetic distich whose two parts may be interpreted independently. As wisdom accomplishes something great, so a single villain may have a far-reaching influence, viz., such as destroys much good.

Solomon, in this chapter, for a further proof of the vanity of this world, gives us four observations which he had made upon a survey of the state of the children of men in it: - I. He observed that commonly as to outward things, good and bad men fare much alike (Ecc 9:1-3). II. That death puts a final period to all our employments and enjoyments in this world (Ecc 9:4-6), whence he infers that it is our wisdom to enjoy the comforts of life and mind the business of life, while it lasts (Ecc 9:7-10). III. That God's providence often crosses the fairest and most hopeful probabilities of men's endeavour, and great calamities often surprise men ere they are aware (Ecc 9:11, Ecc 9:12). IV. That wisdom often makes men very useful, and yet gains them little respect, for that persons of great merit are slighted (Ecc 9:13-18). And what is there then in this world that should make us fond of it?

9:18–10:1 one sinner can destroy . . . a little foolishness spoils: Sin and foolishness can undo a lot of good in a very short time.