All who are prudent act with knowledge, but fools expose their folly.
NMVEvery prudent [man] deals with knowledge: but a fool lays open [his] folly.
OJBEvery prudent man acts with da'as, but a kesil (fool) displays his folly.
RVEvery prudent man worketh with knowledge: but a fool spreadeth out folly.
T4TThose who have good sense always think carefully/wisely before they do something; foolish people show by what they say and do that they are foolish.