Like a lame man’s legs, which hang useless, is a proverb in the mouth of fools.
To recommend wisdom to us, and to quicken us to the diligent use of all the means for the getting of wisdom, Solomon here shows that fools are fit for nothing; they are either sottish men, who will never think and design at all, or vicious men, who will never think and design well. 1.
Commenting on Proverbs 26:6-9
The legs of the lame are not equal,.... Or as "the lifting up the legs by one that is lame" (m), to dance to a pipe or violin, is very unseemly, and does but the more expose his infirmity, and can give no pleasure to others, but causes derision and contempt; so is a parable in the mouth of fools; an apophthegm, or sententious expression...
legs . . . equal--or, "take away the legs," or "the legs . . . are weak." In any case the idea is that they are the occasion of an awkwardness, such as the fool shows in using a parable or proverb (see Introduction; Pro 17:7).