By the blessing of the upright. — Especially by their prayers, which, like Abraham (Genesis 18:23, sqq.), and the Jews of the captivity (Jeremiah 29:7; Ezra 6:10) they offer for those with whom they live.
By the mouth of the wicked — i.e., by the “cursing, deceit, and fraud” with which his mouth is filled (Psalms 10:7).
He that is void of wisdom despiseth his neighbour. — A warning against rash judgments (Matthew 7:1-2). It displays a want of intelligence, very noticeable in uneducated people, not to be able to understand other people’s difficulties; but “a man of understanding holdeth his peace,” not being rash to condemn, as well knowing that he may be mistaken in his estimate of another, and of the wisest course to be pursued.