The wisdom of the prudent is to give thought to their ways, but the folly of fools is deception.
OJBThe chochmah of the prudent is to understand his derech, but the folly of kesilim is mirmah (deceit).
T4TThose who have good sense are wise, so they know what they should do and what they should not do; foolish people do not know what is right to do, but because they think that they do, they are deceiving themselves.