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.

Every prudent man dealeth with knowledge,.... In order to get more, and with men of knowledge for the same purpose; all he does is with knowledge and discretion; he does not meddle with things, nor has he to do with persons, he knows nothing of; he both acts and speaks with knowledge, cautiously, wisely, considering well time, place, and persons: and every wise and good man deals with evangelical knowledge, and studies to grow in the knowledge of the Gospel, and the mysteries of it; in the knowledge of Christ, and of God in Christ; the issue of which is life eternal;

but a fool layeth open his folly; or "spreads" (q) it; and exposes it to the view of everyone, by his foolish talk and indiscreet actions.

(q) "expandit", Mercerus, Gejerus, Michaelis.

dealeth--acts with foresight.

a fool . . . folly--for want of caution.