קהלת, פרק י׳, פסוק י״ב

Human speech holds immense power, acting as a clear dividing line between the wise and the foolish. A wise person naturally speaks with grace, avoiding gossip and choosing only pleasant, appropriate expressions [אבן עזרא, ביאור שטיינזלץ]. The primary approach among commentators is that this gracious speech deeply resonates with listeners, causing people to love the wise person and seek his well-being. Because his words draw people in, they willingly listen to his guidance, often elevating him to positions of greatness and leadership [רש״י, מצודת דוד].

In sharp contrast, a fool speaks without knowledge and ultimately brings about his own ruin, losing his social standing through his careless words [מצודת דוד, אבן עזרא, ביאור שטיינזלץ]. While the fool undoubtedly destroys his own reputation, his destructive speech can also corrupt those around him. In this view, the fool actively leads others astray from the proper path. This destructive influence is compared to the biblical figure Balaam, who disastrously advised the nations to push their daughters into prostitution, thereby shattering the boundaries of modesty that had been carefully maintained since the generation of the Flood [רש״י].

This stark contrast between the wise and the foolish can also be viewed through a historical lens. The wise person, whose words are filled with grace, represents the prophet Jeremiah. Even during the devastating period of the Temple's destruction, he consistently spoke profound truth and wisdom. Conversely, the wicked false prophets of that same generation embody the fool, as they actively undermined and corrupted the true prophet's message [תעלומות חכמה].

Another historical approach views both the wise and the foolish aspects as phases in the life of a single figure: Cyrus, the king of Persia. Initially, he spoke with grace when he granted the Jews permission to leave the Babylonian exile and return to Jerusalem. However, he later devolved into a fool whose words brought ruin when he retracted his initial decree. His foolishness was rooted in his flawed belief that God's presence was confined strictly to Jerusalem, ignoring that His glory fills the entire world. This folly reached its peak when Cyrus canceled his positive decree, forbidding any more Jews from crossing the Euphrates River on their journey to the Land of Israel [תורה תמימה].