Притчи 13:16

16 Every prudent man acteth with understanding; But a fool spreadeth abroad folly. Hitzig reads, with the Syr. (but not the Targ.) and Jerome, כּל (omnia agit), but contrary to the Hebr. syntax. The כּל־ is not feeble and useless, but means that he always acts בּדּעת, mit Bedacht [with judgment] (opp. בּבלי דעת, inconsulto, Deu 4:42; Deu 19:4), while on the contrary the fool displays folly. Pro 12:23 and Pro 15:2 serve to explain both members of the verse. Bedchtigkeit [judgment] is just knowledge directed to a definite practical end, a clear thought concentrated on a definite point. יקרא, he calls out, and יבּיע, he sputters out, are parallels to יפרשׂ. Fleischer: פּרשׂ, expandit (opp. Arab. ṭawy, intra animum cohibuit), as a cloth or paper folded or rolled together, cf. Schiller's (Note: "Er breitet es heiter und glnzend aus, Das zusammengewickelte Leben.") - "He spreads out brightly and splendidly The enveloped life." There lies in the word something derisive: as the merchant unrolls and spreads out his wares in order to commend them, so the fool does with his foolery, which he had enveloped, i.e., had the greatest interest to keep concealed within himself - he is puffed up therewith.

Note, 1. It is wisdom to be cautious. Every prudent discreet man does all with knowledge (considering with himself and consulting with others), acts with deliberation and is upon the reserve, is careful not to meddle with that which he has not some knowledge of, not to launch out into business which he has not acquainted himself with, will not deal with those that he has not some knowledge of, whether they may be confided in. He is still dealing in knowledge, that he may increase the stock he has. 2. It is folly to be rash, as the fool is, who is forward to talk of things he knows nothing of and undertake that which he is no way fit for, and so lays open his folly and makes himself ridiculous. He began to build and was not able to finish.