Yea also, when he that is a fool walketh by the way, his wisdom faileth him, and he saith to every one that he is a fool.
By the way - in his ordinary course; in his simplest acts (Proverbs 6:12-14).
He saith to every one (that) he is a fool - he "saith" virtually "that he" himself is a fool: he betrays himself as a fool. So the Chaldaic and Septuagint But the Vulgate, 'He thinks that everyone (else whom he meets, especially the godly wise) is a fool.' In his self-conceit, he thinks all fools but himself. The English version suits the context best (Proverbs 13:16).